Plaguewrath

[weakwarrior]

It is probablt a non mob monster that happens to end up among the mob if you see such a thing.

Thanks. Very helpful. I've always glossed over the AI section in the guide, but that was a mistake.

Regarding blackskull that seems highly probable since in hell there are so few monsters per level that it is very likely to find a balrog in any given room if there are balrogs on the level.