for last boss, camp in the room, when shrieker spawns, wait for it to despawn, do dmg on boss. shrieker and wizards spawn. leave them alone, they despawn, rinse and -blam!-ing repeat. its literally one of the easiest strikes. -blam!-. edit: literally the only freaking hard part is opening that gate, aside from that, the entire thing is a literal cakewalk, i get drunk on most strikes and the only one i have trouble with are the ones where you can't camp and easy peasy the way through them.