Rusank seems to have a broken ability "Rusank Strike". [Thu Apr 09 23:17:40 2020] Rusank hit you for 119123 points of chromatic damage by Rusank Strike. Spell data says 1: Decrease Current HP by 93693 and has a Resist: Lowest -990 I don't recall ever seeing NPC abilities hitting harder than the advertised DD components, it's usually significantly lower with spell shielding and such factored in. I see back in 2018 they lowered the mob level by 5, was the spell left as is?
It also says on the description "calculates to current max level". Translation: they broke HAs when they added this "max level" crap. They probably broke the scaling in this one like they did in a lot of them.