Type Alias BuffContribution

Type Declaration

• { type: "hit-mod"; value: number }
• { type: "wound-mod"; value: number }
• { type: "save-mod"; value: number }
• { type: "cover" }
• {
      type: "reroll";
      roll: "hit" | "wound" | "save" | "damage";
      subset: "ones" | "all-failures";
  }
• { type: "extra-keyword"; keywordRef: WeaponKeywordRef }
• { type: "feel-no-pain"; threshold: number; scope?: "all" | "mortal" }

  Feel-no-pain: roll one D6 per unsaved wound at threshold+, ignoring the wound on a pass. scope controls which wound stream it applies to:

  • "all" (default): every unsaved wound (main + mortal).
  • "mortal": mortal-wound stream only (e.g. Death Guard 5+ FNP vs mortals). A target may carry both an all-FNP and a mortal-FNP; the engine rolls both against mortals.
• { type: "damage-mod"; value: number }
• { type: "attacks-mod"; value: number }

  Additive modifier to the attacker's per-model attack count (A stat).

• { type: "strength-mod"; value: number }

  Additive modifier to the attacker's Strength stat.

• { type: "toughness-mod"; value: number }

  Additive modifier to the defender's Toughness stat.

• { type: "ap-mod"; value: number }

  Additive modifier to the attacker's weapon AP. AP is signed against the defender's save (negative = more piercing), so a value of -1 here makes the weapon one AP more piercing.

• { type: "damage-reduction"; value: number }

  Defender-side: subtract value from each unsaved damage point (floored at 1 by the engine). Multiple sources do NOT stack in 10e — the largest reduction wins. The corpus also encodes "half" and "to-zero" reductions; the buff layer only models the additive form because the other two are typically one-use ablation that doesn't fold into the expected-value math cleanly.

• { type: "invulnerable-save"; threshold: number }

  Defender-side: ability-granted invulnerable save threshold (e.g. a buff that grants a 4+ invuln). Best (lowest) threshold wins; the engine then picks the better of printed Sv after AP/cover and effective invuln (invuln bypasses both AP and cover).