All the enemies have high HP. You want monsters that slay the enemies. Stack monsters with Deity, Wood or Counter Slayers There are places where you can get a lot of damage by bouncing between enemies and walls. Have more Bounce monsters on your team to maximize damage. All the mobs have a Volatile Blast within 6 or 7 turns that will deal 60,000 damage. You need to clear mobs so you will not take a lot of damage.