While playing this game, i have met some obstacles and unclear monents. In this guide I gather them all together just in case it may be useful for some new players. Or maybe not.
So, let's begin.

---

---

This may be looking funny or just stupid, but some people, including myself, spent hours or even days looking for that fearure.
While being outside of Yllian, press M to open location map. Then, click on globe incon in bottom left corner,
That will bring you to World map, where you can travel between visited regions by right-clicking on required one.

---

---

You can't sell items, but you can salvage them for gold an resources by holding right-click on item in your inventory.
It is impossible to salvage Legendary items and Emotion Shards.

---

---

This is probably longest side quest line in the game, and one of earliest you will encounter.
You will be meeting this joyful pal on multiple occasions while progressing main story line. Each time you meet him he will offer you a quest.
But, in order to get access to next quest in his story, you have complete previous one, which mean if you miss him once, you may be not able to finish his story.
Here is the list of places where he resides waiting for you to pay him a visit:

1. First time you will meet him in Plains of Widows, right after the bridge.
   
   
2. Second meeting will happen in Grayleaf, in Hall of Souls.
   
   
3. 3rd time you meet him in Veranto'or, next to Endworld Inn.
   
   
4. Fourth one is in the Path of Flesh and Flame, in the Birthing Bay.
   
   
5. 5th time is in the Lows. You have to speak with Bruntilda first and accept quest to find Mathieu. Without that he will not appear. After that go to Tomb of Wills (this is main quest location, so it is impossible to miss).
   
   
6. Last time you will meet Mathieu in the Return to the Castle Hale. This is almost the same location as the Plains of Widows but after passage of some time. Go to the place where you first met him and accept final quest in that line.
   
   Then follow the trail of blood to find out what happend to your old friend, and decide his fate.

After completing last quest as one of the outcomes you can get Tights of the Troubadour, legendary pants, or special unit Mathieu, Bard Extraordinaire, turned into a Zombie.

---

---

In Heurik, in the Uru Mines, you will met a demon blacksmith who will give you a quest to bring him a sacrifice in order to create/upgrade a sword. After first sacrifice, note in the journal will tell you to return after importat battle. That means you have to return after fight with a boss in the end of an Act. After each bossfight you can bring one sacrifice and upgrade your sword one grade further.
First two sacrifices are bought from the slaver in the same location, just follow the quest marker.
3rd sacrifice is one of your companions. Not just special unit with unique name, exacly the companion, the one with dialogues and personal questline.
4th sacrifice is the blacksmith himself.
You can do this quest stage by stage after each bossfight or you can just come after 3rd boss and do all the sacrifices in one go.

---

---

In case if your companion haven't survived through your jorney, by making wrong choice in the personal quest line or if you just sacrificed them to get sword in demon forge, you can bring them back to life.
Avaliable after 3rd boss fight, in the Nexus.
Explore the cave until you meet closed caged door.


Go right, cross the bridge and you will find giant purple globe.
It will offer you a ressurection of one of your fallen comrades. Just one - you have to choose if there is more than one.
Note: Mathieu or non-companion special characters cannot be resurrected.

---

---

Special characters are better versions of units you can recruit in Yllian, with about ~5% better characteristics. They all have unique name and can join your party when you meet them in your journey. To level them up you don't need thier respective building, it can bo done in Yllian's Castle.

1. Noemie, Bethrezen's Betrothed - Posessed - Can be found in the Pits in Heurik. Complete her quest and ask her to join instead of giving her what she whats.
   
2. Demor, Elven Prince of the Green Clans - Scout - Can be found in Atellean. You have to complete the quest from Julie from the Peko house, then ask him to join.
   
3. Schism - Feral Elf Warrior - Can be found in Atellean in the Cavern under Bloodroots. Ask him to join during his quest.
   
4. Mathieu, Bard Extraordinaire - Zombie - in Return to the Castle Hale after completing his very long story line, see section above
   
5. King Bernard of Cahuzak - Specter - Can join in Return to the Castle Hale after you complete Sebastian's personal quest, ask him to join instead of letting him go.
   
6. Lilryna - Succubus - Can be found in Heurik. Join her orgy and then ask her to join.
   
7. Hilervor of the Hil Dynasty - Arctic Dryad/Vampire - You will meet her while doing Sharlea's 2nd personal quest, she is the target of this quest. To make her join, persurade Sharlea to spare her life and then ask to join. Or you can ask Sharlea to turn her into Vampire. Warning! By doing that you will fail to obtain Sharlea's personal legendary weapon, which can lead to her death in the future.
   
8. Holy Maiden Isabeau - Priestess - First, you need to accept quest from her husband in Plains of Widows and complete that quest in her favor, not husband's. After that you will meet her later in Path of Flesh and Flames. Ask her to join.
   
9. Akedia, Fallen General of the Greenthroats - Berserker - Alternative to Isabeau. In Plains of Widows bring her to her husband. After that in Path of Flesh and Flames choose to save Akedia instead of Isabeau.
   
10. Emdoun the Wild - Wereleopard - At the end of Melendrach's 3rd personal quest (the one where you have to find 3 packs of wereleopards) ask him to join.
    
11. Pierre, Circuitor of the Scarred - Infernal Knight - While completing second of Bagthals quest in Path of Flesh and Flame, you will meet his former comrades, chained up to each other. Then you have to fight Ziminiar in Illmeren's Temple to know you couldn't break chains. Return to Pierre and choise to free him, not his teammates.
    
12. Genevieve, Holy Lieutenant of the Highfather - Holy Avenger - after completing main quest in the Path of Flesh and Flames, let her live and ask her to go with you.
    
13. Trijimat, Raiser of Meat - Necromancer - In Wotan's Grave, help her complete her unholy ritual, let her live and ask to join.
    
14. Abaddon, Mother of Vampires - Vampire - You will meet her during main quest in Queen's Nest. Let her drink your blood and make pact with her. When opposing Mortis and Council of Six, remind her about the pact and call for her aid. Important! In Liberation mode if you will use new special option, she will not join your side, but also won't side the Council, and, basicaly, just disappear. This may be a bug.
    
15. Aurelik - Overlord - Barat Nor, Elder's Hideout. Do as he want, and he will join you.
    
16. Marfalla - Sundancer - She may join you if you ask if you peacefully finish Ormeriel's 3rd personal quest.
    
17. Nep - White Dragon - In Plains of Widows, you have to kill both Baron and Elves and return dragon eggs to Enk. In Return to the Castle Hale you have to try to convince Was-Enk to leave Mortis' side and fight her after she refuses. Nep will join after that.
    
18. Tyga - Scout - Can be found in the Path of Flesh and Flame during Orion's personal quest 'Sticky fingers'. Kill Eva and ask him to join after the battle.

There is also several semi-special units, with unique way of acquiring, but they are lacking anything inherent to other special units.

• Bone Golem in the Grayleaf. You have to feed him 4 bones. 3 of them are found in the Grayleaf, 4th one is located in Wotan's Grave near nameless destroyed temple below Wotan's Axe, guarded by powerful squad of undead. This Golem cannot be leveled in Yllian's Castle, only in Graveyard. But you can choose his name from 3 options!
  
• Young Williamson - Arcanist - Can join you in the Lows in Grim William's Pub. Offer William's sons to join you in the end of argue with Grim William. One of the sons will be non-spectial Imperial Assassin, other one - Young Williamson. He can't be leveled in both Yllian's Castle and Mage Guild, only way to level him is through combat.
  
• Two slaves meant to be sacrificed to create a sword. First one is Posessed, bought for 500 gold from the slaver in Uru Mines. She will stay with you if you buy her but not sacrifice. If you do, some time later you can buy second slave, Berserker, for 1500 gold. He will stay with you until you decide to sacrifice him. You can do it, or you can change your mind.

---

---

All companions, except Orion, have 3 personal quests.
Completing first quest makes companion join you and opens strategic ability to remove blockers from the map.
Completing second quest grants you unique legendary wepon for your companion.
Completing thrid quest finishes the story of your character. If the character stays alive and decides to stay with your party, they will be granted powerful ultimate ability.
In the case of Orion, first quest grants him both strategic ability and weapon, second one grants the ultimate.
All the characters will give you thier second respective quests after you complete Act I (defeat Veran in the Veranto'or, first game boss). All charcaters except Corisandre and Ormeriel will give the quests via dialogue in Yllian Castle.
According to Steam's achievements statistic, Corisandre's and Ormeriel's quest lines are completed by least number of players, probably because it is very easy to miss thier quests in that place.

• Corisandre's second quest is avaliable in Atellean. You have to talk with guard at the north gate of the Veil's camp. He will only appear after you visit location for a secont time.
  
• Ormeriel's second quest is avaliable in Atellean. You have to talk with elf near Cavern of the Bloodroot. He will only appear after you visit location for a secont time.

Keep in mind that your actions will have the consequences.
Out of all companions, I will specially mention Sharlea, as her choices are least obvious, spoilers ahead! You probably will want her to show mercy and spare her sister life. Maybe out of pity, maybe you want special unit. But if you do it, she will lose her legendary weapon and, in 3rd quest, she will die.
All the characters will give you thier thrid respective quests after you complete Act II (defeat Inquisitor in the Lows, second game boss). All charcaters except Sebastien, Orion and Sharlea will give the quests via dialogue in Yllian Castle.

• Sebastien's quest will be avaliable in the Hale Castle's dungeon. Speak with his 'son'.
  
• Orion's quest will be avaliable after completing Hale Castle main story quest. Speak with the scout outside of castle's dungeon.
  
• Sharlea's quest will be avaliable in Queen's Nest after defeating the Council of Six and completing main quest. Follow the trail of blood and defeat Sharlea in battle. Let Ejamar help her and she may survive.

---

---

You will be able to open that chest in Leberation mode (NG+) after reaching level 50.

---

---

This is all I can remember in one go. If I remember somethigh else, I will add it.
If you have any additions or fixes to the written above, or have met something curious you wish to share - write it here in commentaries, I will add it to the guide. Or just write your own guide! This game surely lacks guides.

---

---