Birth feats are not something you need to worry about too much on your first playthrough (and I generally recommend the default party for that), but once you want to explore the many different ways in which Dungeons of Chaos can be enjoyed, playing around with feats is one key element.

Feats in general can be described in 4 parts:

• what classes can take them
  
• what benefits do they bring (usually mysteriously described as a "+" or "++". Exact bonus is NOT revealed but "++" is better than "+")
  
• what downside do they come with ("- -" is worse than "-")
  
• how rare it is to appear in a random roll

4 feats are showing with each roll.  They may not suit the class you want to pick at all, so it is also perfectly possible to have a player without a birth feat.  But many people try to roll a specific target character.  If the feat is rare, they would roll until it shows up and then see if they can live with the stat roll.  If stats are more important, they focus on good stats and then see if the feats are ok. I am aware that some players spend HOURS rolling for what they want the perfect party to be. That is not required to win or enjoy the game. But some do find it thrilling to achieve that perfect start party they have thought up.

Since 2.0.330, there is an unlockable achievement that enables a feat category selector, so that not all feats are being rolled from, but only those of the category you selected before clicking the roll button.  Does allow some degree of pre-determining what you want to get.

PHYSIQUE [most common] [category: PHYSICAL]
CLASSES ALLOWED:  fighter, barbarian, ranger, archer, rogue, monk, druid
NOT ALLOWED:  cleric, mage
BONUS:  Str+, Dex+, Health+
DOWNSIDE:  none
A no-nonsense boost to the most basic stats.  Can make the difference on whether you can equip that piece of armor or weapon you have been eyeballing.

DWARVISH ANCESTRY [very common] [category: ANCESTRY]
CLASSES ALLOWED:  fighter, barbarian, ranger, monk, cleric, druid
NOT ALLOWED:  archer, rogue, mage
BONUS:  Str+, Health++, Resist Cold+ Poison+ Stoning+, Gold+, Gear (Depends on class chosen: Axe, Hammer, Shield ...), Harden Up Skill+
DOWNSIDE:  Speed-, Mana-
Clearly a good set of features for a melee character or even monk or druid.

NOBLE ORIGIN [very common] [category: RICHES]
CLASSES ALLOWED:  fighter, archer, ranger, cleric, mage
NOT ALLOWED:  barbarian, rogue, monk, druid
BONUS:  Gold+++, Gear (Depends on class chosen: nice helms or enchanted jewelry...)
DOWNSIDE:  none
Not powerful in the long run but a good starting boost if you want to be well equipped from the go get, or to stock up in store right away.

TOUGHNESS [very common] [category: PHYSICAL]
CLASSES ALLOWED:  fighter, barbarian, ranger, archer, rogue, monk, druid
NOT ALLOWED:  cleric, mage
BONUS:  Resist Fire++ Cold++ Lightning++
DOWNSIDE:  none
May not be your obvious choice initially but in certain stages of the game you may want to have someone that can withstand a fistfight with enemies dealing elemental damage (and lots of it).

ELVEN ANCESTRY [common] [category: ANCESTRY]
CLASSES ALLOWED:  fighter, archer, ranger, rogue, monk, cleric, mage, druid
NOT ALLOWED:  barbarian
BONUS:  Dex+, Speed+, Evasion+, Mana+
DOWNSIDE:  Health-
Nothing terribly exciting but an overall good net benefit for any spellcaster, ranger or rogue

MENACE [common] [category: POWERS]
CLASSES ALLOWED:  fighter, barbarian
NOT ALLOWED:  archer, ranger, rogue, monk, cleric, mage, druid
BONUS:  Rage Skill ++
DOWNSIDE:  none
You REALLY get into the mood for battle.  Deep into it...

BATTLEHARDY [common] [category: WEAPON]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Weapon proficiency ++
DOWNSIDE:  none
Tailored to include those weapon types common for the class (including unarmed for monks), this feat gives you a good boost to those skills, with all its benefits (more advanced weapon attack styles, and better accuracy).

INTELLECT [common] [category: MENTAL]
CLASSES ALLOWED:  archer, ranger, rogue, monk, cleric, mage, druid
NOT ALLOWED:  barbarian, fighter
BONUS:  Mana++, Perception Skill+, Identify Skill+
DOWNSIDE:  none
Can't go wrong with this for a spellcaster, the extra skills help with out of combat non-magical stuff as well as finding treasures or spotting monsters when resting.

ORCISH ANCESTRY [common] [category: ANCESTRY]
CLASSES ALLOWED:  fighter, barbarian, ranger, monk, druid
NOT ALLOWED:  archer, rogue, cleric, mage
BONUS:  Str+, Health+, Resist Fire+ Cold+++ Poison+++ Stoning++ Sleep++, Harden Up Skill+, Rage Skill+
DOWNSIDE:  Mana---
Not what you would like to see in a mirror, but on a stats sheet of your fighters this is quite pleasing.

PROTEGE [uncommon] [category: RICHES]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Whatever spell and skill level (or access at all) your class usually gets at level ~5, you have it from the start
DOWNSIDE:  none
Weapon skills, cooldown skills, daily skills, resist and attack spells ... if a skill or spell is useful, why not have more proficiency in it?  I call this the most underrated feat based on player feedback to date.  Probably because it does not come with ground braking changes or cinematics.  It is just as if you had been grinding for a bit.

IMMUNITY [uncommon] [category: POWERS]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Resist Poison ++++
DOWNSIDE:  none
In some situations you may think this is useless.  In others, it is the difference between life and certain death.

SUREHANDED [uncommon] [category: WEAPON]
CLASSES ALLOWED:  fighter, ranger, archer, rogue, monk
NOT ALLOWED:  barbarian, cleric, mage, druid
BONUS:  Critical Hit Chance ++
DOWNSIDE:  none
Having been blessed with a sense for battle as well as a keen mind for anatomy, you make your hits count (read: HURT).  Some classes lack one of the two though so can't use this feat.

ANTINODE [uncommon] [category: FREAK]
CLASSES ALLOWED:  fighter, barbarian, ranger, archer, rogue, monk
NOT ALLOWED:  cleric, mage, druid
BONUS:  Resist Magic+++
DOWNSIDE:  Mana---
If you REALLY hate everything about magic, would rather not use it yourself, and not take too much damage if it is thrown at you, then this is right up your alley.

BODY CONTROL [uncommon] [category: PHYSICAL]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Resist Sleep+++ Paralysis+++
DOWNSIDE:  none
Arguably SLEEP condition is not yet implemented, however PARALYSIS would always be the more important factor of the two.  Paralysis can make you be inactive during significant portions of a fight without you actually realising that it is those instances of forced inactivity that makes you lose the fight over and over again.  Spectres are one of the creatures that really use this a lot.

TREE HUGGER [uncommon] [category: POWERS]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Nature Ally skill ++ (and class cap 99)
DOWNSIDE:  cannot use the shoe or necklace equipment slots
Nature Ally is a nice skill to have early in the game, it can if successful make one or more wolves appear.  Chance of failure reduces with level, and wolf count increases.  At high level it is also rumored to summon a more fierce nature ally.  Can help a lot with low level fights at the start, but also provide a valuable distraction in later fights to throw in some wolves and chew on the back rank spellcaster type mobs that otherwise take too much time to reach and silence.

BLACK SHEEP [uncommon] [category: POWERS]
CLASSES ALLOWED:  rogue
NOT ALLOWED:  fighter, barbarian, ranger, archer, monk, cleric, mage, druid
BONUS:  Shadow Shift Skill ++
DOWNSIDE: none
Some are born into a career of walking the shadows.  And with enough experience, you find that all shadows are connected... shadow shift is a short range teleportation skill that goes from one entity's adjacent tile to another entity's adjacent tile.

SWIFTNESS [uncommon] [category: PHYSICAL]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Speed++, Evade+
DOWNSIDE: none
A clear benefit to those that want to do something quick so they can either deal more damage over time or get out of harms way.

INHERITANCE - ARMOR [uncommon] [category: RICHES]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  does what it says on the tin: you get a piece of armor that is quite valuable and its enchantment/stats are specifically useful for your class
DOWNSIDE: none
Not uber-powerful but a good and safe way to pick something that can make a starting difference without causing issues elsewhere.

INHERITANCE - RING OR AMULET [uncommon] [category: RICHES]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  does what it says on the tin: you get a ring or amulet that is quite valuable and its enchantment is specifically useful for your class
DOWNSIDE: none
Not uber-powerful but a good and safe way to pick something that can make a starting difference without causing issues elsewhere.

NERD [uncommon] [category: MENTAL]
CLASSES ALLOWED:  ranger, archer, monk, rogue, cleric, mage, druid
NOT ALLOWED:  fighter, barbarian
BONUS:  Identify Skill++++ (and has seen each item type at least 10 times)
DOWNSIDE: STR-, Evasion-
Saves money and saves having to wait to use (potentially) cool items you find.

STONE SKIN [uncommon] [category: PHYSICAL]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Armor vs pierce+++ force++ slice++
DOWNSIDE: Speed-, Evasion--
Hard, slow, extra armor.

PERUN DISCIPLE [uncommon] [category: DAMAGE]
CLASSES ALLOWED:  fighter, barbarian 
NOT ALLOWED:  ranger, archer, rogue, monk, cleric, mage, druid
BONUS:  Axe Skill+ (and class cap 99);  when wielding an axe: physical damage++, accuracy+++, cut chance +
DOWNSIDE:  non-axe weapon skills -
You have devoted yourself to combat with an axe.  You excel in your fighting skills with axes compared to any other weapon type, and your class cap for axe skill is 99.  When using an axe, you do way more damage and strike more accurate and with a slightly higher chance to cause bleeding wounds.  

BO MASTER [uncommon] [category: DAMAGE]
CLASSES ALLOWED:  monk
NOT ALLOWED: fighter, barbarian, ranger, archer, rogue, cleric, mage, druid
BONUS:  Staff Skill+ (and class cap 99);  when wielding a staff: physical damage++, accuracy+++, stun chance +
DOWNSIDE:  none
Your life as a monk always included the desire to defend people from violent folks.  You are skilled in combat with a staff, and your class cap for the staff skill is 99.  When using a staff, you do way more damage and strike more accurate and with a slightly higher chance to stun the opponent.  

DAGDA PROPHET [uncommon] [category: DAMAGE]
CLASSES ALLOWED: cleric, druid
NOT ALLOWED: fighter, barbarian, ranger, archer, rogue, monk, mage
BONUS:  1H Blunt Skill+ (and class cap 99);  when wielding a 1H blunt weapon: physical damage++, accuracy+++, stun chance +
DOWNSIDE:  none
Although your education was focussed on arcane skills and spells, you were never shy to pick up a sceptre and strike your foes directly.  You are unusually skilled in combat with a 1H blunt weapon, although you still adhere to class specific restrictions on which item is suitable and which isn't.  But your class cap for the 1h blunt skill is 99.  When using a 1H blunt weapon, you do way more damage and strike more accurate and with a slightly higher chance to stun the opponent. 

CHARGER [uncommon] [category: DAMAGE]
CLASSES ALLOWED: mage
NOT ALLOWED: fighter, barbarian, ranger, archer, rogue, monk, cleric, druid
BONUS:  if wielding a staff weapon: staff deals additional melee magic damage++ (scales with your level)
DOWNSIDE:  mana (-)
You have always felt a staff gives you access to a unique ability: to use the staff to strike foes with your own magical aura.  Anytime you wield one, you can feel a part of your natural magical powers come to live that is otherwise dormant.  You are not specifically skilled to strike opponents with a staff, but when you do for example as a last line of defense, it deals magical damage (scaling with your level).

RIGHTEOUSNESS [rare] [category: POWERS]
CLASSES ALLOWED:  fighter,archer, ranger, monk, cleric, mage, druid
NOT ALLOWED:  barbarian, rogue
BONUS:  Vs. undead damage bonus of 40-50%, and clerics or monks also get a proficiency (1) in exorcism skill.  Divine Empowerment Skill + 10
DOWNSIDE:  none
If you happen to curse a lot under your breath when fighting the lich or spectres, maybe give this a try.

HALFLING ANCESTRY [rare] [category: ANCESTRY]
CLASSES ALLOWED:  fighter, monk, rogue, druid
NOT ALLOWED:  barbarian, ranger, archer, cleric, mage
BONUS:   Dex+, Evasion+, Skill Identify+ Sneaking+ Endure Elements+ Taunt+ Nimble+ Lock Picking+ Dodge+
DOWNSIDE:  Health--, STR--
Halflings are not the best at anything particular, but have a clear tendency to be good at nifty things without being as squishy as gnomes are.

TROLL ANCESTRY [very rare] [category: ANCESTRY]
CLASSES ALLOWED:  fighter, barbarian, druid
NOT ALLOWED:  ranger, archer, rogue, monk, cleric, mage
BONUS:   STR+++, Health++, Health regeneration+++
DOWNSIDE:  Mana--, DEX--, Speed--, Evasion--
Trolls are great for bashing skulls in and regenerating their own wounds on the fly.  Really great.  Anything else? Not so much.

NODEMASTER [very rare] [category: MENTAL]
CLASSES ALLOWED:  monk, cleric, mage, druid
NOT ALLOWED:  fighter, barbarian, ranger, archer, rogue
BONUS:   Mana regeneration+++
DOWNSIDE:  Speed-, Evasion-, Lower Poison Resist (inherent and endure element stat is halved.  Item bonus still works)
Not much is known about the origins of magical powers really.  Some characters are way better at replenishing their mana reserves than others.  It is less noticeable that they also tend to suffer from a slight sluggishness, and are very vulnerable to poison.

DYNAMO [very rare] [category: DAMAGE]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:   Lightning Damage added to your attack.  Strongest for unarmed, normal for melee, and small for ranged weapons.  Scales up with your player level.
DOWNSIDE:  Resist Magic--- (inherent player stat is set to ZERO.  Item bonus still works)
A mystery why some have this ability, at their will they can deal lightning damage as part of their melee attack.  For ranged attacks, they charge static electricity onto their ammunition for at least a smaller version of it.  The powers that enable this ability unfortunately seem to make the person very vulnerable to magic damage.

GNOME ANCESTRY [very rare] [category: ANCESTRY]
CLASSES ALLOWED:  monk, rogue, druid
NOT ALLOWED:  fighter, barbarian, ranger, archer, cleric, mage
BONUS:   Dex++, Evasion++, Speed++, Skill Identify++ Sneaking++ Perception++ Nimble++ Lock Picking++ Dodge++ Decoy+
DOWNSIDE:  Health---, STR---
Gnomes can be a perfect accompaniment (if you ever come across one that wants to join you) if you need some locks picked or things found.  But you really need to shelter them in battle as they can't take too many hits.  But with dodge and decoy abilities, they come prepared for being a force to stay out of harm.

PRESIDENTIAL CANDIDATE [very very rare] [category: FREAK]
CLASSES ALLOWED:  rogue
NOT ALLOWED:  fighter, barbarian, ranger, archer, monk, cleric, mage, druid
BONUS:   Backstab Skill+, Taunt Skill++, Evasion++
DOWNSIDE:  Accuracy----, cannot wear rings or amulets
A very specific breed of rogues.  Trumps others in backstab and evasion, and his taunt can make even a seasoned enemy stray from their expertise tactics, but in the end he sucks at pretty much everything else.

CARRIE [very very rare] [category: FREAK]
CLASSES ALLOWED:  mage, druid
NOT ALLOWED:  fighter, barbarian, ranger, archer, monk, rogue, cleric
BONUS:   IGNITE Spell+++, Mana++
DOWNSIDE:  Speed----
A rare to find one-trick pony.  But what a fiery trick it is... if you can live with the super slow speed they have.

FROST HANDS [very very rare] [category: DAMAGE]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:   Cold Damage and a small freeze effect is added to your unarmed attacks.  Does not apply when you use a held weapon. So a cestus still works, anything where you still apply the UNARMED weapon skill.  Scales with your level.
DOWNSIDE:  DEX--, cannot wear gloves, Resist Fire--- (inherent player stat is set to ZERO.  Item bonus still works)
Not many people have ever seen this.  The hands are deformed but have an inner blue glow...

The following feats are unlockable via certain late-game achievements.  If you browse through the achievements from the main menu or the party's log, it will say what each unlocks:

GIFTED [common] [category: PHYSICAL]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Health+,  Mana+
DOWNSIDE:  none
A simple but effective moderate boost to both health and mana.  If you don't want any downsides attached to the more exotic feats, this is the one for you.

FAMOUS CHAMPION [common] [category: RICHES]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  improved shop prices when buying items
DOWNSIDE:  Evasion---
Once you finished the game up to chapter 2 chasm fight with ZERO deaths, you get access to this feat.  It gives far better prices for items you buy from a shopkeeper.  The extent is not static, the effect is greatest where shops have been charging outrageous prices.  It does not stack so having more than one player with it does nothing on top.

BOOKWORM [common] [category: MENTAL]
CLASSES ALLOWED:  ranger, rogue, monk, cleric, mage, druid
NOT ALLOWED:  fighter, barbarian, archer
BONUS:  Magic Lore +++, Monster Lore +++
DOWNSIDE:  Evasion--, STR--, DEX--, Resist Critical Hits--
A knowledgable person can be squishy.  But if you see his potential to master powerful spells, you won't mention it to his face again...

JUGGERNAUGHT [common] [category: POWERS]
CLASSES ALLOWED:  fighter, barbarian, ranger
NOT ALLOWED:  archer, rogue, monk, cleric, mage, druid
BONUS:  gains the repulsion skill (and class cap 99), Rage skill+, Berserkers Will++, health++, STR++++
DOWNSIDE: ZERO Evasion (inherent player stat is set to ZERO.  Item bonus still works), cannot equip rings or amulets
Once you finished the game up to chapter 2 chasm fight with less than 10 deaths, you get access to this feat.  It makes the player a strong tank, with the strength and health and skills you need.

AEDUI SENATOR [uncommon] [category: ANCESTRY]
CLASSES ALLOWED:  druid
NOT ALLOWED:  fighter, barbarian, ranger, archer, monk, rogue, cleric, mage
BONUS:  Nature Ally Skill ++ (and class cap 99), Summon Golem spell+ (although needs a lot of mana, not something cast in the early levels), Mana++
DOWNSIDE: Mana Regeneration----- (greatly reduced mana regeneration, even those coming from item boosts), not able to use the Dark Channeling Skill (ever)
An old type of powerful druid, this caste is very versed in the summoning of allies and golems.  But their magical skills are somewhat different to those of modern classes, and brings comparative disadvantages in terms of regenerating your powers.

DARK LORD [uncommon] [category: POWERS]
CLASSES ALLOWED:  mage, druid
NOT ALLOWED:  fighter, barbarian, ranger, archer, monk, rogue, cleric
BONUS:  Access to the Wither Ray and Summon Demon spells (although he needs to level up to establish enough mana to cast it!!), Dark Channeling Skill+(and class cap 99), Mana++
DOWNSIDE:  DEX--, Can only use the first ring itemslot, ZERO Resist Lifedrain (inherent player stat is set to ZERO.  Item bonus still works)
If you like chunky abilities with chunky downsides that play differently than a vanilla parties, then look no further.  The powers are not all feasible at first, as the spells need a fair bit of mana to cast, but once the demons start coming this is a juicy player. Just watch out for the occasional mishap that leaves a hostile demon next to him, in particular with that low lifedrain resist...

DISPLACED [uncommon] [category: POWERS]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Shadowshift and Nimble and Sprint skill from birth (and shadowshift class cap 99), DEX++, Evasion+++
DOWNSIDE:  health---, ZERO Resist Lightning/Fire/Cold/Magic (inherent player stat is set to ZERO.  Item bonus still works)
Completing a certain set of arena challenges grants access to this birth feat.  You become VERY agile and hard to hit.  But if someone DOES hit you, you hurt. Being able to give ANY class the ability to shadow shift can make for very interesting builds, like a magic user able to evacuate from a melee attack like the lich does, or a rogue shifting in to backstab.

BLOOD LUST [uncommon] [category: POWERS]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Lifesteal: a % of damage heals you (7% unarmed,  5% melee, 3% ranged), Life Drain Damage ++
DOWNSIDE:  Evasion----, No vs. undead bonus. Ever.
Those that are on the brink of vampirism have clear benefits in combat, if it weren't for the fact that their reaction time is very slow.  Or may it is their cockiness that comes with being one step closer to perceived immortality... And neither items nor spells nor skills can grant them any bonus vs. undead.

DRAGON BLOOD [uncommon] [category: POWERS]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Summon dragon skill + (and class cap 99), Health++, Health regeneration+
DOWNSIDE:  Resist Cold--- (inherent player stat is set to ZERO.  Item bonus still works)
Clearly boasting with health, those that have somehow been granted a little favour of Zomok just have to deal with a tiny inconvenience of NIL cold resistance (before item bonuses).  The temptation is of course there to reach out to Zomok and plead for help once in a while.  Zomok may do nothing.  Or he may send you a dragon as an ally during combat.  Or you may catch him in a bad mood, and a dragon appears in the enemies' ranks... and don't even ask what he will do if you dare to ask twice in the same fight (which is by the way only possible if you have two players with the skill).

OBSESSED DWARF [rare] [category: FREAK]
CLASSES ALLOWED:  fighter, barbarian, ranger, monk, cleric, druid
NOT ALLOWED:  archer, rogue, mage
BONUS:  Finds a LOT more gold.  More than one player means it scales up, although at reduced effect
DOWNSIDE:  Loses gold each turn.  Also scales by the number of players with this feat.
Getting HEAPS of gold is cool!  Getting it back to a shop on time to spend it ... is an art form.

APOTHECARY [very rare] [category: DAMAGE]
CLASSES ALLOWED:  fighter, ranger, rogue, monk, druid
NOT ALLOWED:  barbarian, archer, cleric, mage
BONUS:   Poison Damage added to your attack.  Strongest for unarmed, normal for melee, and small for ranged weapons.  Scales up slowly with your player level.
DOWNSIDE:  Health-(-) [less than '--' but more than '-'] , Fire Resistance Halved (after items even), cannot use the shield itemslot
Always busy fiddling with his concoctions, making his attacks poisonous.  But his arsenal of tools is susceptible to fire.

ZOMOK APPRENTICE [very rare] [category: POWERS]
CLASSES ALLOWED: anyone (but only ONE per party)
NOT ALLOWED:  none
BONUS: Small Lifesteal %. Shadowshift Skill++.  Summon Dragon Skill +++.  
DOWNSIDE:  Zero cold resistance before items.
The fate of some rare person may have been set before he was even born.  Chosen by a deity, for reasons that may never reveal themselves, they are offered abilities that surpass any normal mortal.

The following birth feats are unlocked by completing one of the fixed party challenges (in itself, those can be tried once you completed the game at least once). They vary in difficulty, and match the desirability of the feats they unlock:

SYMBIANT [rare] [category: MENTAL]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS:  Can equip any insignia (and indirectly learn many skills and spells across many classes)
DOWNSIDE:  Mana--, Health-, Resistance halved (even after items) for: Critical Hits, Paralysis, Poison
Supernatural and little understood, sometimes someone is born with the ability to understand and utilise abilities that are usually restricted to those that underwent lifelong class-restricted training.
This is a feat unlocked by the very difficult 'Misfits' fixed party challenge.  A true achievement, and a treat to play around with.

SOUL HARVESTER [very rare] [category: POWERS]
CLASSES ALLOWED:  all
NOT ALLOWED:  none
BONUS: Lifesteal++. Any physical damage dealt in weapon attacks gives a portion back as health. Does not scale with level.  And during fights, any enemy killed with a direct attack (melee, ranged or attack spell) gives the Soul Harvester 5% of his health and mana back, and gains a temporary speed bonus of 2.
DOWNSIDE:  Can never progress the Nimble or Dodge skill, and cannot wear any torso armor
Somehow instilled with the evil essence of the soul sucker race, a player with this birth feat thrives on killing and harvesting enemies.  Tactically very interesting against swarming enemies.
This is a feat unlocked by the 'Monkeys' fixed party challenge.

FOUL ONE [very rare] [category: FREAK]
CLASSES ALLOWED: fighter, barbarian, ranger, archer, rogue, mage, druid
NOT ALLOWED:  monk, cleric
BONUS: Small Lifedrain Damage. Some for unarmed, small for melee, and smaller for ranged weapons.  Scales up with your player level.  Lifedrain Resist++.   Has access to the Summon Minor Undead Skill (+1 proficiency per level).  And at level 15, this player also gets access to the Summon Major Undead Skill (+1 proficiency per level after level 15).
DOWNSIDE:  Requires twice the experience points than normal to advance levels. Suffers damage if a Holy Chant is active. Health -. No vs. undead bonus. Ever.
An even darker and more evil birth feat than a soul harvester, a foul one is linked to the One and his army of the undead.
This is a feat unlocked by the 'Monkeys' fixed party challenge.