Zalmarath is super buggy/bad

Zalmarath seems a pretty straight-forward boss. dodge the hands and sword, avoid the projectiles, kill the adds, all while shooting him on the edge of the platform.

Unfortunately the sword attack goes in random directions without telegraphing at all and is a one-shot mechanic, the arm randomly grabs and teleports my character even when I dodge, and his hitbox is terrible! I right-click him to launch my projectiles, and they either go in the wrong direction and miss him, or go right through him and still miss him. (Cold Sorc) When I do eventually freeze him and try to Cold snap him half the time I'm spamming all over his character and not getting the right hitbox to actually shatter him.

animations don't go where they should, i take no damage from animations that hit me, but die to mechanics i dodge, my minion tries attacking the hand which is out of reach instead of the body, at one point i was teleported and stuck midair until something hit me and i came back down, at one point he moves and a quarter of the room seems to be an invisible wall I can't move into, my freeze debuff stacks up to 99 and stops for a good 30 sec before it actually freezes him.