0.11.5, Windows 10. RD 581, Frostbite Caverns
Bounty for Mindwurm for the Nature Guild; killing all monsters on the floor (checked the map, monster count 0) did not make the false god door appear.
I then summoned a set of 5 packs from the div candle to try to fix the issue and received the message after killing the last one that the door appeared nearby, but it was still nowhere to be found.
I was also presented with the option of choosing immunity to spell damage three times on different runes (but did not choose it). Not sure if that’s relevant or normal behavior.
Save & restart and redoing the realm fixed the issue.