damage resistances

Damage Resistances

Armor can reduce incoming damage through three layers, available at a set level and inside pieces.<piece>:

{
  "damage_resistances": {
    "#minecraft:is_projectile": 0.125, 
    "minecraft:lava": 0.20, 
    "iceandfire:dragon_fire": 0.225
  },
  "attacker_resistances": {
    "minecraft:skeleton": 0.05,
    "#minecraft:undead": 0.10,
    "mekanism:*": 0.05,
    "player:SomeName": 1.0
  }, 
  "conditional_resistances": [
    {
      "attacker": "minecraft:skeleton",
      "damage": "#minecraft:is_projectile",
      "amount": 0.10
    },
    {
      "attacker": "minecraft:skeleton",
      "damage": "minecraft:mob_attack",
      "amount": 0.15
    }
  ], 
  "show_player_resistances": false
}

Field	Type	Description
damage_resistances	Map	Damage type → reduction. Exact IDs, tags (#), and modded types. See Damage types
attacker_resistances	Map	Attacker → reduction. Exact entity IDs, entity tags (#), mod wildcards (mod:*), players (player:Name)
conditional_resistances	List	Rules with attacker, damage and amount — applies only when both match
show_player_resistances	Bool	false by default: player: entries never appear in the tooltip
inherit_set_resistances	Bool	Inside a piece: false makes it ignore every set-level resistance. Default true

Values are per equipped piece. 0.125 on all four pieces is 50% with the full set worn, 25% with two pieces. Design around the full set, then divide.

Set level and per piece. Entries declared inside pieces.<piece> merge with the set-level ones, winning only on the keys they declare. Scope merges; layers are replaced. The two rules are independent.

{
  "damage_resistances": {
    "#minecraft:is_fall": 0.10,
    "#minecraft:is_fire": 0.10
  }, 
  "pieces": {
    "boots": {
      "durability": 481, 
      "defense": 3, 
      "damage_resistances": {
        "#minecraft:is_fall": 0.15
      }
    }
  }
}

The boots resist fall at 0.15 and still resist fire at 0.10; the other three pieces keep 0.10 for both. Total fall reduction with the full set: 45%.

To take a piece out of the set-level resistances entirely, set inherit_set_resistances to false inside it. That piece then uses only what it declares — and one that declares nothing contributes no resistance at all:

{
  "pieces": {
    "chestplate": {
      "durability": 592,
      "defense": 8,
      "inherit_set_resistances": false,
      "damage_resistances": {
        "#minecraft:is_projectile": 0.15
      }
    },
    "helmet": {
      "durability": 407,
      "defense": 3,
      "inherit_set_resistances": false
    }
  }
}

Conditional rules merge by their attacker + damage pair: a piece rule with the same pair replaces the set rule, and any other one is added alongside it.

Specificity, not accumulation. Each equipped piece resolves on its own: the three layers are evaluated in order — conditional → attacker → damage — and the first layer with any match replaces the more general ones for that piece, even when its value is lower. Within a layer, matching entries add together; the pieces then add together.

Because pieces resolve independently, a conditional rule on one piece does not silence the others: they keep contributing through whichever layer matched for them.

With a full set using the values above:

Incoming attack	Layer that wins	Reduction
Skeleton arrow	conditional (0.10)	40%
Skeleton melee	conditional (0.15)	60%
Pillager or player arrow	damage (0.125)	50%
Zombie melee	none	0%

Note the third and first rows: a skeleton's arrow is reduced less (40%) than anyone else's arrow (50%), because the specific rule replaced the general one. If you want the specific case to be stronger, give it a higher value.

Reductions are clamped to 1.0 (100%). There is no balance ceiling — total immunity is a valid design choice, and the mod will not second-guess it.

Projectiles are attributed to their owner: an arrow counts as minecraft:skeleton, not as the arrow entity. This applies to attacker_resistances and to the attacker half of conditional rules.

Hidden player entries. player:Name matches one exact Minecraft username (not a Discord name, and it is case-sensitive). These entries are excluded from the tooltip so that surprise or event armor doesn't announce itself — set show_player_resistances to true to display them.

Everything here applies live with /customgear reload.