I really like that you can encounter things like "a skeleton of a kobold" or "a zombie of a tourist". It's really entertaining. However, I just encountered the ghost of a mistress warlady on GC2, who promptly delimbed and beheaded me before I had much of a chance to react.
I'm wondering what sort of relations there are between the former monster and it's undead counterpart, and what spawn conditions/controls are set for them. Obviously I should never encounter a real mistress (let alone mistress warlady) on GC2 outside of wizmode or a mid/late game return to New Attnam. The fact that this one showed up - in ghost form, but still extremely dangerous - makes me wonder however...
(Note: this was in 507.)