Lich Path: Locked in the Ziggurat *Spoiler*

After killing Ciar in the Ziggurat, I recruited him into my party immediately as a new undead companion. After returning upstairs to report my victory to the Pillar of Skulls I found that the exit to Drezen was missing from the map.

I couldn’t find a way to make it reappear.

What version are you playing? The patch notes of 0.5.2i mentioned that this bug was fixed.