For no apparent reason in the middle of my fight against the lighthouse horror, a bunch of normally-hidden NPC's down on the beach by the base of the lighthouse decided to join the fight (on my side, which didn't matter). Then my ranger teleported into the void (17, -10) and couldn't do anything at all. (No teleporter pyramids.)

http://cloud-4.steampowered.com/ugc/3335222970903694912/C9990010F050FCE12BCD6D7DF8517E01E78C7EB4/

I had to stop after the fight was over and my other guys had died, because my ranger was stuck in the void and couldn't move.