diff --git a/src/lib/game/upgrade-effects.ts b/src/lib/game/upgrade-effects.ts
index f6d3971..f1f7566 100755
--- a/src/lib/game/upgrade-effects.ts
+++ b/src/lib/game/upgrade-effects.ts
@@ -94,6 +94,7 @@ export const SPECIAL_EFFECTS = {
   FIRST_STRIKE: 'firstStrike',           // +15% damage on first attack each floor
   OVERPOWER: 'overpower',                // +50% damage when mana above 80%
   BERSERKER: 'berserker',                // +50% damage when below 50% mana
+EXECUTIONER: 'executioner',             // +50% damage when enemy below 25% HP
   COMBO_MASTER: 'comboMaster',           // Every 5th attack deals 3x damage
   ADRENALINE_RUSH: 'adrenalineRush',     // Defeating enemy restores 5% mana