diff --git a/src/battle-phases.ts b/src/battle-phases.ts
index 71b2afe60..201f991d9 100644
--- a/src/battle-phases.ts
+++ b/src/battle-phases.ts
@@ -1150,8 +1150,8 @@ export class WeatherEffectPhase extends CommonAnimPhase {
     if (this.weather.isDamaging()) {
       const inflictDamage = (pokemon: Pokemon) => {
         this.scene.queueMessage(getWeatherDamageMessage(this.weather.weatherType, pokemon));
-        pokemon.damage(Math.ceil(pokemon.getMaxHp() / 16));
         this.scene.unshiftPhase(new DamagePhase(this.scene, pokemon.isPlayer()));
+        pokemon.damage(Math.ceil(pokemon.getMaxHp() / 16));
       };
 
       const playerPokemon = this.scene.getPlayerPokemon();
diff --git a/src/data/battler-tag.ts b/src/data/battler-tag.ts
index 5dc4abf82..af21f88b0 100644
--- a/src/data/battler-tag.ts
+++ b/src/data/battler-tag.ts
@@ -177,9 +177,9 @@ export class ConfusedTag extends BattlerTag {
         const atk = pokemon.getBattleStat(Stat.ATK);
         const def = pokemon.getBattleStat(Stat.DEF);
         const damage = Math.ceil(((((2 * pokemon.level / 5 + 2) * 40 * atk / def) / 50) + 2) * ((Utils.randInt(15) + 85) / 100));
-        pokemon.damage(damage);
         pokemon.scene.queueMessage('It hurt itself in its\nconfusion!');
         pokemon.scene.unshiftPhase(new DamagePhase(pokemon.scene, pokemon.isPlayer()));
+        pokemon.damage(damage);
         (pokemon.scene.getCurrentPhase() as MovePhase).cancel();
       }
     }
@@ -206,8 +206,8 @@ export class SeedTag extends BattlerTag {
       pokemon.scene.unshiftPhase(new CommonAnimPhase(pokemon.scene, !pokemon.isPlayer(), CommonAnim.LEECH_SEED));
 
       const damage = Math.max(Math.floor(pokemon.getMaxHp() / 8), 1);
-      pokemon.damage(damage);
       pokemon.scene.unshiftPhase(new DamagePhase(pokemon.scene, pokemon.isPlayer()));
+      pokemon.damage(damage);
       pokemon.scene.unshiftPhase(new PokemonHealPhase(pokemon.scene, !pokemon.isPlayer(), damage, getPokemonMessage(pokemon, '\'s health is\nsapped by LEECH SEED!'), false, true));
     }
     
@@ -240,8 +240,8 @@ export class NightmareTag extends BattlerTag {
       pokemon.scene.unshiftPhase(new CommonAnimPhase(pokemon.scene, pokemon.isPlayer(), CommonAnim.CURSE)); // TODO: Update animation type
 
       const damage = Math.ceil(pokemon.getMaxHp() / 4);
-      pokemon.damage(damage);
       pokemon.scene.unshiftPhase(new DamagePhase(pokemon.scene, pokemon.isPlayer()));
+      pokemon.damage(damage);
     }
     
     return ret;
diff --git a/src/data/move.ts b/src/data/move.ts
index a9f5fad17..8b7e1f8ce 100644
--- a/src/data/move.ts
+++ b/src/data/move.ts
@@ -746,9 +746,9 @@ export class RecoilAttr extends MoveEffectAttr {
       return false;
 
     const recoilDamage = Math.max(Math.floor(user.turnData.damageDealt / 4), 1);
-    user.damage(recoilDamage);
     user.scene.unshiftPhase(new DamagePhase(user.scene, user.isPlayer(), MoveResult.OTHER));
     user.scene.queueMessage(getPokemonMessage(user, ' is hit\nwith recoil!'));
+    user.damage(recoilDamage);
 
     return true;
   }
@@ -763,8 +763,8 @@ export class SacrificialAttr extends MoveEffectAttr {
     if (!super.apply(user, target, move, args))
       return false;
 
-    user.damage(user.getMaxHp());
     user.scene.unshiftPhase(new DamagePhase(user.scene, user.isPlayer(), MoveResult.OTHER));
+    user.damage(user.getMaxHp());
 
     return true;
   }
@@ -959,7 +959,7 @@ export class ClearWeatherAttr extends MoveEffectAttr {
 
 export class OneHitKOAttr extends MoveHitEffectAttr {
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
-    target.hp = 0;
+    target.damage(target.hp, true);
     user.scene.queueMessage('It\'s a one-hit KO!');
     return true;
   }
diff --git a/src/modifier/modifier-type.ts b/src/modifier/modifier-type.ts
index 8b45b09db..b27b3f936 100644
--- a/src/modifier/modifier-type.ts
+++ b/src/modifier/modifier-type.ts
@@ -533,6 +533,9 @@ const modifierTypes = {
   BERRY_POUCH: () => new ModifierType('BERRY POUCH', 'Adds a 25% chance that a used berry will not be consumed',
     (type, _args) => new Modifiers.PreserveBerryModifier(type)),
 
+  FOCUS_BAND: () => new PokemonHeldItemModifierType('FOCUS BAND', 'Adds a 10% chance to survive with 1 HP after being damaged enough to faint',
+    (type, args) => new Modifiers.SurviveDamageModifier(type, (args[0] as Pokemon).id)),
+
   LEFTOVERS: () => new PokemonHeldItemModifierType('LEFTOVERS', 'Heals 1/16 of a POKéMON\'s maximum HP every turn',
     (type, args) => new Modifiers.TurnHealModifier(type, (args[0] as Pokemon).id)),
   SHELL_BELL: () => new PokemonHeldItemModifierType('SHELL BELL', 'Heals 1/8 of a POKéMON\'s dealt damage',
@@ -613,6 +616,7 @@ const modifierPool = {
     new WeightedModifierType(modifierTypes.CANDY_JAR, 3),
     //new WeightedModifierType(modifierTypes.OVAL_CHARM, 1),
     new WeightedModifierType(modifierTypes.HEALING_CHARM, 1),
+    new WeightedModifierType(modifierTypes.FOCUS_BAND, 3),
     new WeightedModifierType(modifierTypes.LEFTOVERS, 2),
     new WeightedModifierType(modifierTypes.SHELL_BELL, 2),
     new WeightedModifierType(modifierTypes.BERRY_POUCH, 3),
@@ -641,6 +645,7 @@ const enemyModifierPool = {
   ].map(m => { m.setTier(ModifierTier.GREAT); return m; }),
   [ModifierTier.ULTRA]: [
     new WeightedModifierType(modifierTypes.ATTACK_TYPE_BOOSTER, 5),
+    new WeightedModifierType(modifierTypes.FOCUS_BAND, 2),
     new WeightedModifierType(modifierTypes.LUCKY_EGG, 2),
   ].map(m => { m.setTier(ModifierTier.ULTRA); return m; }),
   [ModifierTier.MASTER]: [
diff --git a/src/modifier/modifier.ts b/src/modifier/modifier.ts
index 50132bcf4..eb43dfe7a 100644
--- a/src/modifier/modifier.ts
+++ b/src/modifier/modifier.ts
@@ -349,6 +349,41 @@ export class AttackTypeBoosterModifier extends PokemonHeldItemModifier {
   }
 }
 
+export class SurviveDamageModifier extends PokemonHeldItemModifier {
+  constructor(type: ModifierType, pokemonId: integer, stackCount?: integer) {
+    super(type, pokemonId, stackCount);
+  }
+
+  matchType(modifier: Modifier) {
+    return modifier instanceof SurviveDamageModifier;
+  }
+
+  clone() {
+    return new SurviveDamageModifier(this.type, this.pokemonId, this.stackCount);
+  }
+
+  shouldApply(args: any[]): boolean {
+    return super.shouldApply(args) && args.length === 2 && args[1] instanceof Utils.BooleanHolder;
+  }
+
+  apply(args: any[]): boolean {
+    const pokemon = args[0] as Pokemon;
+    const surviveDamage = args[1] as Utils.BooleanHolder;
+
+    if (!surviveDamage.value && (this.getStackCount() === this.getMaxStackCount() || Utils.randInt(10) < this.getStackCount())) {
+      surviveDamage.value = true;
+
+      pokemon.scene.queueMessage(getPokemonMessage(pokemon, ` hung on\nusing its ${this.type.name}!`));
+    }
+
+    return true;
+  }
+
+  getMaxStackCount(): number {
+    return 5;
+  }
+}
+
 export class TurnHealModifier extends PokemonHeldItemModifier {
   constructor(type: ModifierType, pokemonId: integer, stackCount?: integer) {
     super(type, pokemonId, stackCount);
@@ -374,7 +409,7 @@ export class TurnHealModifier extends PokemonHeldItemModifier {
   }
 
   getMaxStackCount(): number {
-    return 16;
+    return 4;
   }
 }
 
@@ -403,7 +438,7 @@ export class HitHealModifier extends PokemonHeldItemModifier {
   }
 
   getMaxStackCount(): number {
-    return 16;
+    return 4;
   }
 }
 
@@ -733,6 +768,10 @@ export class HealingBoosterModifier extends PersistentModifier {
 
     return true;
   }
+
+  getMaxStackCount(): number {
+    return 4;
+  }
 }
 
 export class ExpBoosterModifier extends PersistentModifier {
diff --git a/src/pokemon.ts b/src/pokemon.ts
index a232315da..83c410f35 100644
--- a/src/pokemon.ts
+++ b/src/pokemon.ts
@@ -8,7 +8,7 @@ import * as Utils from './utils';
 import { Type, getTypeDamageMultiplier } from './data/type';
 import { getLevelTotalExp } from './data/exp';
 import { Stat } from './data/pokemon-stat';
-import { AttackTypeBoosterModifier, PokemonBaseStatModifier, ShinyRateBoosterModifier, TempBattleStatBoosterModifier } from './modifier/modifier';
+import { AttackTypeBoosterModifier, PokemonBaseStatModifier, ShinyRateBoosterModifier, SurviveDamageModifier, TempBattleStatBoosterModifier } from './modifier/modifier';
 import { PokeballType } from './data/pokeball';
 import { Gender } from './data/gender';
 import { initMoveAnim, loadMoveAnimAssets } from './data/battle-anims';
@@ -522,11 +522,11 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
         }
 
         if (damage) {
-          this.damage(damage);
-          source.turnData.damageDealt += damage;
-          this.scene.unshiftPhase(new DamagePhase(this.scene, this.isPlayer(), result as DamageResult))
+          this.scene.unshiftPhase(new DamagePhase(this.scene, this.isPlayer(), result as DamageResult));
           if (isCritical)
             this.scene.queueMessage('A critical hit!');
+          this.damage(damage);
+          source.turnData.damageDealt += damage;
         }
 
         switch (result) {
@@ -549,10 +549,17 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     return result;
   }
 
-  damage(damage: integer): void {
+  damage(damage: integer, preventEndure?: boolean): void {
     if (!this.hp)
       return;
 
+    if (this.hp > 1 && this.hp - damage <= 0 && !preventEndure) {
+      const surviveDamage = new Utils.BooleanHolder(false);
+      this.scene.applyModifiers(SurviveDamageModifier, this.isPlayer(), this, surviveDamage);
+      if (surviveDamage.value)
+        damage = this.hp - 1;
+    }
+
     this.hp = Math.max(this.hp - damage, 0);
     if (!this.hp) {
       this.scene.pushPhase(new FaintPhase(this.scene, this.isPlayer()));