[Taqwus]

Noticed something curious when I had my Lich Queen wear the Robe of Calius the Druid.

Electricity resistance -- 50%. Check.
Cold resistance -- something higher than 100%. Check.
Fire resistance -- 50% VULNERABILITY. Hmmm. Remove robe: no more fire vulnerability. Eh?

Robe appears to be bugged. Recalling my impression that I once lost an Abysian Demonbred when his fire resist somehow was lower than 100% and his neighbors' heat auras overloaded his fatigue, makes me wonder whether any of the other full/partial fire items gives vulnerability instead.

From what I recall, at least the rings of fire immunity are not bugged (at least on Ice Devils from a previous game).