This mod for Valkyria Chronicles is a rebalance mod for the main game and the DLCs, making the game overall more challenging (aside from Selvaria DLC). This mod is made for a fresh new game (start New Game in the opening screen).

Download link:
https://drive.google.com/file/d/0B8UcX57M5WX6NU5qSG5HNGJ1Qk0/view?usp=sharing
EDIT: Google drive told me some people couldn't download the file due to a security update so I'm posting a new link for those who may have problems:
https://drive.google.com/file/d/0B8UcX57M5WX6NU5qSG5HNGJ1Qk0/view?usp=sharing&resourcekey=0-KjAfE-glZOQWryNL588kZw

In this archive, you will find the following files:
- "My VC Mod" directory: this is the mod itself, copy/paste all the files into your "Valkyria Chronicles" directory (it should be in Steam/SteamApps/common)
- "Reset Extra DLCs" directory: containing a file named "sysdata.dat" which you can copy into your savedata folder to reset the Extra DLCs (as if you never played "Behind her Blue Flame" and "Enter the Edy Detachment" DLCs).
- "Files Backup" directory: those are the original files, if you want to revert back to the vanilla version of the game.
- "README" file: which contains informations about the mod.


VERY IMPORTANT:

• ALWAYS KEEP ALICIA, ROSIE & LARGO IN THE SQUAD
  
• DO NOT LET ANY OF THEM DIE PERMANENTLY
  
• OR AT THE VERY LEAST DO NOT LET ALICIA DIE BEFORE CHAPTER 8A

The reason is, they are not leader anymore in this mod (they don't give a CP, thus you are not feeling forced to deploy them and can choose who you deploy more freely) and as a result they can be kicked out of squad 7 and can die permanently. It is not gamebreaking in itself except for Chapter 8a battle where Alicia is required to complete one of the victory conditions.

General:
- A-Rank turn requirements have been changed accordingly due to the rebalance.
- Rewarded cash and experience bonuses have also been changed. Overall if you A rank and kill all enemies, 50% of the reward is from the base cash/exp bonus, 25% is from the mission rank, and 25% is from killing key targets.
- Edy Squad Skirmishes don't give any EXP/DCT reward anymore to prevent early-game grinding exploits and the weapons earned have been heavily altered.
- Enemy stats have been increased so that their stats would be close to Squad 7 units at the same level. Before, enemies had pretty poor stats overall compared to Squad 7.
- Critical (headshot) damage multiplier has been reduced to x2 damage. It was originally x3.5 in VC1. As another example, it was x2.5 in VC2 & VC3.
- Damage reduction from evading has been reduced.
- Defense bonus from camps has been increased.
- Defense bonus from crawling is changed to be the same as crouching.

Infantry, Structures:
- All infantry got an AP increase except for Scouts and Engineers.
- Alicia, Rosie and Largo are no longer leaders with an auto-assigned CP bonus. Also, you are no longer forced to deploy them on certain missions. The number of CPs you get per mission has been changed accordingly to make up for this.
- Musaad, Lynn, Audrey, Knute and Emile are no longer hidden characters and can be added to the squad like anyone else.
- Snipers and Anti-Tank Cannons can now fire interception rounds. Snipers have a small interception radius and turn more slowly than other units to face you when preparing to fire.
- Shocktroopers have a wider interception radius.
- Blast Armor (Lancer Armor) damage reduction to explosions has been reduced. Lancers can walk on a few mines, but can no longer clear a whole minefield by themselves.
- Certain enemy units had their vsArmor statistic increased to damage your tanks with their interception fire (For example the Marberry turrets).
- Enemy aces and bosses also have modified stats.
- Most enemies now use black armor, while aces retain their red armor; purely aesthetic to make it easy to know that the mod is active.

Weaponry:
- Most weapon stats have been changed overall. As an example accuracy has been increased for most weapons to create less early-game frustration such as Lancers missing from point blank range.
- Enemy weapon stats have been changed dramatically across the board.
- Both Anti-Infantry and Anti-Tank mines do more damage.
-The R&D has been revamped for several weapons to get rid of useless skill trees. For example, Sniper Rifles now have the skill trees "Anti-Infantry", "Anti-Tank", "Interception". Another example is with the Flamethrower skill trees being changed to "Anti-Infantry" and "Anti-Tank".
- The "Aim" stat is now truer to the aiming reticle.
- Engineers get their own anti-tank grenades upgrades.
- Some rifles are Scout-only or Engineer-only now.

Tanks:
- Enemy tanks' radiator resistance has been increased. Changed to be similar to VC2 and VC3 where killing a tank with a Scout is harder.
- Edelweiss last weapon upgrade also increases its power and not just its range.
- Shamrock's gatling can now intercept during enemy turn.
- Tank parts have been changed to HP (body and tread), DEF (body and tread), Radiator, Accuracy and AP.
- Tank parts are smaller and give a higher bonus.

Orders & Potentials:
- Certain Potentials and Orders have been removed or changed. Example Orders: Caution, Penetration. Example Potentials: Resist Crossfire, Invincible, Phoenix, Double Movement. Some Potentials were changed into a trade-off (for example, "Double Movement" became the "Second Wind" Potential which restores your AP on top of your HP when you use your Ragnaid).
- Potential Effects and Activation Requirements were also changed overall. Example Potential: "Stealth" which increases Defense is completely useless when no one shoots at you so it was changed to give an Attack boost instead.
- Potentials have a higher activation rate, many closer to 100%. Before, there were many Potentials that no one ever saw get activated because of their low activation probabilities.
- Orders were altered overall in regards to effects and CP costs. For example, Defense Boost has been nerfed, and Aim Boost has been buffed.
- Orders unlock requirements through leveling have been changed completely.
-The old man at the graveyard can now give you any one of his 9 teachable Orders starting from chapter 4 unlike before where he would have a smaller pool of random orders that increased per chapter. Recon Request is still NG+ only.

Selvaria DLC:
- All imperials are now aces.
- All imperials are now leaders.
- All imperials have powerful weapons.
- All imperials have high stats.
- All Gallians shall die!

Alicia, Rosie and Largo don't give a CP anymore but you still get as many CPs as if they were deployed which means you aren't "forced" to deploy them anymore. As a side effect, they can be removed from Squad 7 and die permanently. If they are not in Squad 7, the game won't deploy them in maps where they are deployed by default (see list below) and you won't be able to use their deployment spot. This also means that you can't beat chapter 8a if Alicia is not in Squad 7 for
that battle (as she is required to complete the victory conditions).

I would highly recommend not to remove them from Squad 7 and to make sure they do not die permanently (at the very least that Alicia survives up to chapter 8a).

Battles where Alicia, Rosie or Largo are deployed by default:
- Prologue: Alicia is deployed
- Chapter 1: Alicia is deployed
- Chapter 2: Alicia is deployed
- Chapter 3: Alicia, Rosie and Largo are deployed
- Chapter 8a: Alicia is deployed
- Chapter 8b: Alicia is deployed
- Chapter 14: Rosie and Largo are deployed
- Largo's Report: Largo is deployed
- Alicia's Report: Alicia is deployed
- Rosie's Report: Rosie is deployed
- Welkin's Report: Rosie and Largo are deployed
- Marberry Shore Hard Skirmish: Alicia, Rosie and Largo are deployed
- Marberry Shore Expert Skirmish: Alicia, Rosie and Largo are deployed
- Upper Fouzen Expert Skirmish: Alicia, Rosie and Largo are deployed
- Edy's Trooper Challenge: Rosie is deployed

Tank parts (or upgrades) don't always show all stat changes. Red and yellow parts upgrade HP and Defense respectively for both Body and Tread (despite the game displaying only increasing one or the other depending if you're buying the part or equiping it). Purple parts increase; it's properly displayed when buying it but not when equiping it (show Ammo 0 -> 0).

The scenes after each Edy's challenges depend on the vanilla version ranks. For example, I set Susie's Challenge A rank requirement to 2 turns but she will still congratulate you on an A rank up to 7 turns because the A rank was 7 turns originally.

If you use a vanilla game save, you may encounter those glitches:
- Scouts and troopers with engineer hand grenades. I set the 3rd & 5th grenade upgrades to be engineer-only but if you had already upgraded to such grenade in your save, your scouts and troopers may have that engineer-only upgrade.
- Some scouts/engineers improperly equipped (because I set some scout rifles to be scout-only or engineer-only) and you may need to re-equip them.
- Impossibility to unlock some orders as I changed the way orders are unlocked by leveling classes (if you already had all class at level 20 in your save, this shouldn't be a problem).

Squad 7 base AP and elite bonuses

Enemy Stats at different levels:

Aces and Bosses also had their stats changed.

Edelweiss and Shamrock stats:

Imperial Tanks:

Bunkers, Gatlings and AT-Cannons:

Bosses and uncommon tank units also had their stats changed.

Notes:
- Accuracy is the aiming circle size, the lower it is, the smaller the aiming circle and the more accurate the weapon
- Gallian-A's 0 range means it can't intercept, team-attack or counter-attack and its damage decreases over distance (up to 1000 range).

Scout/Engineer Rifles:

Note: Accuracy is the aiming circle size, the lower it is, the smaller the aiming circle and the more accurate the weapon

Edelweiss Weapons (base version and last upgrade for each):

Most potentials activation rates have been increased to 25%, 50%, 75% or 100%. Only the very bad potentials (Humanitarian, Moody, Maintenance Lazy, Jam-Jinxed, etc...) have their activation rate reduced to 5%.

Most regular attack and defense changes are 25% increase or decrease (instead of 40%). Most regular accuracy and evasion changes are 50% to 100% increase or decrease (instead of 40%). Most all-stats changes are 10% increase or decrease. Hidden or higher tier potentials grants higher bonuses or maluses.

Some potentials activation are not Full-Screen anymore.

PERSONAL POTENTIALS:
- Camp Defender increases defense on top of evasion
- Born Leader increases all stats and activates with no ally nearby(instead of increasing defense with 3 allies nearby)
- Camaraderie increases all stats (instead of evasion)
- Outcast decreases all stats (instead of evasion)
- Into Macho Men increases accuracy (instead of evasion)
- My Way increases accuracy and attack power (instead of evasion)
- Chameleon increases accuracy (instead of defense)
- Impatient decreases accuracy (instead of defense)
- Energetic increases accuracy on top of evasion
- Cocky decreases accuracy on top of evasion
- Stage Fright greatly decreases both accuracy and evasion (instead of dropping AP to 0).
- Loyal Teammate increases all stats and activates with no ally nearby
- Big Sister increases all stats except defense.
- Song of Peace increases all stats except defense.
- Maternal increases all stats.
- Valkyria greatly increases all stats and grants invicibility when HPs reach a single digit.
- All Welkin potentials increase all stats.

BATTLE POTENTIALS:
- Stealth (scouts) increases attack power (instead of defense)
- Resist Crossfire (scouts) has been replaced by Stand Ready
- Double Movement (scouts) has been replaced by Second Wind (using a Ragnaid recovers AP)
- Kamikaze (troopers) activates under half HP (instead of a single digit HP)
- Phoenix (troopers) has been replaced by Strengthen (using a Ragnaid grants resistance to interception fire)
- Invincible (engineers) has been replaced by Strengthen (using a Ragnaid grants resistance to interception fire)

BATTLE POTENTIALS WITH 100% ACTIVATION RATE:

Leveling each class unlocks 3 orders related to the class main stat; the first two orders are unlocked before elite, the last order at very high level.
- Scouts: Evade Boost, All units Evade, Perfect Evasion
- Troopers: Attack Boost, All Units Attack, Neutralize
- Lancers: Damage Boost, All Units Damage, Attack Weak Spot
- Engineers: Defense Boost, All Units Defend, First Aid
- Snipers:, Aim Boost, All Units Aim, Perfect Accuracy

Leveling engineers also unlocks the utility orders:
- Antidote, Medic Request, Resupply, Healing Boost, Explosive Boost

The old man can teach 9 orders randomly from the first time you meet him in chapter 4 (still one per chapter max):
- Healing Request
- Heal All
- Retreat
- Awaken Potential
- Awaken All
- True Awakening
- Sniper Request
- Mortar Request
- Artillery Support
And on NG+, he can teach his last order:
- Reckon Request

If you want to mod the game yourself, you can check this topic on gameFAQs:
http://www.gamefaqs.com/boards/942165-valkyria-chronicles/72017723
Where Loviepoo posted a program he wrote to make editing the .mxe files a lot easier without going through hex editing:
http://www.gamefaqs.com/boards/942165-valkyria-chronicles/72017723/826375813

Thanks to Porcupine who got me to hex-edit the game on PS3 and for his helpful work at decyphering the VC PS3 save files back then. Thanks to J_Stickman for rewriting the list of changes in proper english (english is not my first language).

Credits to J_Stickman for finding a name for the mod (Gallian Crossfire). I'm so bad at naming things it would have been a disaster had I attempted to find a name myself.

And of course, thanks to anyone who downloads this mod and gives it a try.
I hope you enjoy this mod and have fun playing through the game again.