diff --git a/data/mods/feuu/moves.ts b/data/mods/feuu/moves.ts
index b78b92f6dc..b29855258a 100644
--- a/data/mods/feuu/moves.ts
+++ b/data/mods/feuu/moves.ts
@@ -149,7 +149,7 @@ export const Moves: {[moveid: string]: MoveData} = {
 					this.debug('move weakened by grassy terrain');
 					return this.chainModify(0.5);
 				}
-				if (move.type === 'Grass' && attacker.isGrounded()) {
+				if (move.type === 'Grass' && attacker.isGrounded() && !attacker.hasAbility('mystic')) {
 					this.debug('grassy terrain boost');
 					return this.chainModify([0x14CD, 0x1000]);
 				}
@@ -218,7 +218,7 @@ export const Moves: {[moveid: string]: MoveData} = {
 			},
 			onBasePowerPriority: 6,
 			onBasePower(basePower, attacker, defender, move) {
-				if (move.type === 'Electric' && attacker.isGrounded() && !attacker.isSemiInvulnerable()) {
+				if (move.type === 'Electric' && attacker.isGrounded() && !attacker.isSemiInvulnerable() && !attacker.hasAbility('mystic')) {
 					this.debug('electric terrain boost');
 					return this.chainModify([0x14CD, 0x1000]);
 				}
@@ -278,7 +278,7 @@ export const Moves: {[moveid: string]: MoveData} = {
 			},
 			onBasePowerPriority: 6,
 			onBasePower(basePower, attacker, defender, move) {
-				if (move.type === 'Psychic' && attacker.isGrounded() && !attacker.isSemiInvulnerable()) {
+				if (move.type === 'Psychic' && attacker.isGrounded() && !attacker.isSemiInvulnerable() && !attacker.hasAbility('mystic')) {
 					this.debug('psychic terrain boost');
 					return this.chainModify([0x14CD, 0x1000]);
 				}