Mount & Blade II: Bannerlord
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Marnah93 and Philozoraptor

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About this mod

This mod makes combat more realistic. Armored units are more resistant to damage. Each weapon type has different effect vs armor. All units defend themselves more, units with shields actually use the shields. Projectile damage is based on kinetic energy, ranged weapons use poundage and missile weight based simulation. AI tactics improved.

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This mod makes combat more realistic. Armored units are more resistant to damage depending on weapon type used vs armor. Each weapon type has different effect vs armor. All units defend themselves more, units with shields actually use the shields. All projectiles now cause damage based on their kinetic energy. Kinetic energy of projectiles is result of simulation based on real life experimental data. All battles are significantly longer now. Damage of horse charge is physics based, couched lancing is scientifically accurate. AI armies use more tactics. Spears are buffed in melee in comparison to vanilla.

  • The Mod is separated into three submodules, one contains all the changes to AI and tactics. Second one contains all the changes to damage, armor, weapons, horses and physics. Third one is total unit overhaul that is savegame compatible.
  • AI module should work with any kind of unit overhaul without conflict. Combat module will need compatibility patch if it is used with unit overhaul that also adds armors and ranged weapons to the game or modifies them. Unit overhaul can be both safely added to and removed from already running campaign.
  • Combat module in a nutshell:  
  1. In the base game there are three types of damage: pierce, cut and blunt. In this mod each weapon type has unique armor penetrating properties, which results in more realistic experience. For example sword is poor at cutting heavy armor, axe is better at this and mace punches through the best. Values for weapon modifiers and few others are all configurable in config file. 
  2. Projectile speed is simulating real life physics. Bows and crossbows have their draw weight displayed as missile speed stat. Actual speed of projectile is based on weapon type, draw weight (missile speed), missile weight and many other factors such as draw length and efficiency of energy transfer from work to stored energy, then from stored energy to actual projectile. Crossbows, longbows and composite recurve bows (mostly horse archer bows) have each unique simulation based on real life experimental evidence. For example composite bows are more efficient than longbow of same poundage and they are more efficient with lower weight arrows. Generally higher weight arrows are more energy efficient than lower weight arrows (damage) but heavier projectiles are slower and therefore have shorter range just like in real life. 
  3. Javelins and throwing axes are good against lightly armored enemies and they can destroy shields now. Arrows now also deal reasonable damage to shields. Speed of the throw is based on weight of throwable - smaller = faster, larger = slower. 
  4. Shields now have realistic hitboxes ( vanilla their collision hitbox is much bigger then their visual size). This means arrow volleys or well aimed shots can now go around shield or even pass through shieldwall (hitting arms, heads or legs that are sticking out). 
  5. Couched lances now deal less damage (100-300) that is based on scientific research instead of crazy 500-900 which guaranteed instant kill all the time in vanilla, all spears and lances that can be used on horse are couchable now. Stabbing with spear from horseback will generally cause less damage than couching at high speed as was the case historically. Couchable lance are held in last third of the shaft and are longer to reflect their purpose of outranging spearmen and regular horsement on the other side they are less wieldy and pretty much useless outside of charging. 
  6. Horse charge cause physics based damage. Base damage of spears was buffed, spears deal much more damage from point blank range than in vanilla and have longer reach. High velocity armor piercing arrows can potentially penetrate shields and cause damage to its wearer. 
  7. All armors were rebalanced based on their material and how well they cover bodies of their wearers. 
  8. Hitboxes were reworked, to reflect actual armor coverage of armor pieces: Head hitbox = 100 % of helmet armor, neck hitbox = 80 % of helmet armor, chest and abdomen hitbox = 100 % of "body armor" on your chestpiece, shoulder (breasts, shoulders and upper half of arm in game) = 100% of armor on your shoulder piece and 100% of your "arm armor" on your chestpiece, hand hitbox (from hand to elbow) = 100 % of armor on your gloves, leg hitbox = 50 % of your boot armor and 50 % of your "leg armor" from your chestpiece.
  9. Melee weapons have weights and speed closer to the historical weapons (they are lighter) than in vanilla.
  10. Two handed swords can be used as bastards with both hands and one hand (since zweihanders are real 2h-only swords and they are difinitelly not present in Bannerlord).
  11. As a final result battles are much longer and more realistic now.
  • AI module in a nutshell: 
  1. Esentially armies will use some tactic (instead of Charge) when in battle, in vanilla army leader needs to have like 150-200 tactics skill for this to happen, with RBM tactics will always happen. 
  2. Also some of the vanilla tactics are literally broken or not function properly so we disabled these (circle of sucide when facing horse archers, hold the "choke point" in shield wall until you get surrounded and murdered and so on). 
  3. We also upgraded the remaining tactics. For example archers will often stand behind infantry line in much wider formation than infantry so they can flank while having some protection. When army holds the high ground it will actually do few steps forward so archers can properly shoot and infantry in front of them does not obscure vision, in vanilla archers actually stood behind the hill and they could not shoot while infantry stood on the hill. 
  4. Horse skirmishers (javelins) will circle around enemy formation and throw all their javelins (just like horse archers) and only after that they will charge, in vanilla they just charge through formation and sometimes throw javelins. 
  5. Horse archers will circle around from safe distance so they wont just bump into enemy infantry all the time. 
  6. Cavalry will used their couched lances properly, it will charge then disengage to the distance and then charge again instead of getting stuck in the fight. 
  7. When archers are in range but for some reason they cannot shoot, for example because of hill they will do few steps forward, they will keep doing this until most of them starts shooting. 
  8. Soldiers with shields will block arrows more often and when under heavy fire entire formation will raise their shields. 
  9. Units block and parry much more than in vanilla which makes the combat bit longer, this depends on skill of soldier and combat difficulty setting. 
  10. Infantry will properly throw their javelins both when defending and attacking.
  11. Soldiers will now properly use ladders during sieges, siege towers work bit better too, but we recommend using ladders for now.
  12. Defenders will now properly hold the gate when it is broken and the wall when it is breached.

    Also all of this aplies to AI, player can activate all the tactics related stuff by "delegating command to sergeants" with either entire army or specific unit formation (proper charging with cav and proper distance with horse archers work with "Charge" command as well).

  • Unit overhaul:
  1. Units have correct gear for their tier. Balance of other two RBM modules is taken into consideration.
  2. Each nation have specific strenght and minor clans are very specialized.
  3. Works as standalone too.
  4. Weapons in arenas are changed back to their sharp versions (blunt ones are OP with RBM).
  5. You need to replace your spnpccharacters.xml file, so make backup or use Steam verify feature if you find out tha you dont like the unit overhaul.

Our optional mods (in files section below main mod files):

  • VolunteersUpTier - this optional mod changes starting tier of volunteers that appear in settlements. This tier is configurable with config.xml in mod files. This submod aims to up the difficulty in campaign mode. AI lords in campaign fight battles all the time and they often loose entire armies, so then they fill up their whole armies with recruits. Player is much better at conserving units and often has elite armies. As a result battles in campaign are often extremly one sided because of this. This mod serves as hotfix for this problem as AI lords armies will be closer to player's and battles should be a more challenging. In future we hope there will be some other way to fix this problem ( better soldiers from prosperity, training soldiers in castles and so on ). Works also as standalone.
  • Lord Retinue Uptier - this optional mod improves the armies (AKA retinues) that are spawned with AI lords (not your companions) when they are spawned / released / ransomed / escape from captivity. This will put more good units into game and also make battles vs AI armies harder.
  • Improved Spear Performance - gives spear full damage during entire animation including beginning of it, spears will not get stucked to allies when used in tight formation, inspired by now defunct fix the spears dude. Works both as standalone and with RBM. Requires native files to be overwritten so make backup.
Recommended mods:
  • RTS camera - very good mod, sadly since 1.5.3 it interferes with at least one of our features, troops generraly clamp more together with this mod which puts 2handed units into disadvantage. So use only at your own risk as it will affect AI in battles in unintended way.

Check whether these mods are supported in current version of the game before installing them.

Warning: Most mods that modify spitems.xml (for example some armor mods) do it in a very clunky way and change the entire file, as a result balance of our mod is broken by these mods (for example bows are turned into ballistas :D). If you want to avoid these issues try loading our mod last or try disabling the other mods.

Please note that any mod that affects stats of bows, crossbows, arrows and bolts is not compatible with the combat module.
Any mod that changes how damage formula of arrows or melee weapons works is also not compatible with combat module.
Other mods should be compatible.

Special thanks to Mod Template for Visual Studio mod which allowed us to do this mod and Another Armor Damage mod which helped us understand programming in Bannerlord.

Source files are included. For finding how code works in original game i highly recommend program called ILSpy. You can use it to browse game's .dll files and see original methods and callbacks.

Put our mods in modules folder just as any other mod, run DLL activator. We recommend manually installing the mods, there seem to be problems such as crashes for some people when using vortex.

Before posting your problem or question please check the sticky posts, you may find solution to your problem or answer to your question there.

Source code:
GitHub Project