Realm 44 boss suggestion

Due to Damaos’s boss mechanic, him recieving Mend or being healed in any way (via spell gems or artifact effects) can cause the boss to become a stalemate. Maybe his damage reduction should also apply to his healing recieved, or at least give him immunity to Mend? Doing 5% damage to a boss restoring 15% max HP per turn is just annoying.