The boss Ares Savage Spear in Aquila is always casting four times per round, twice before I cast and twice after. This plus his 4500 health and his X cast self in the middle having a fixed amount of damage plus a feint ward no matter how many pips he has in his pip circle equals invincibility. He must be made easier or kicked out and replaced by a gorgon which plays fairly: Medusa Venom Snake. I hope you do something about Ares Savage Spear.
Stop using single target attacks on him and he'll stop getting all the free cheat attacks. He only casts the natural attack every 3-4 rounds for 1 pip, and it's 40% trap, not a feint. As cheating bossing go, he's one of the easiest.