Empress

I wouldn't label it as anger.
I've known for a while now that empress has been killable, as it was killed in many worlds prior to this.
The fact that it requires hacks leads one to the obvious conclusion that anyone who uses said hacks should be banned.
Although, I've heard that the method requires no hacks at all, and has other requirements that are made easier to fulfill with said hacks.
I haven't exactly tested it extensively, all I know is that going solo and without hacks caused it to still heal on me.