ToME: the Tales of Maj'Eyal

I run TOME 4 through Steam on Mac OS X 10.11.6 I was playing Possessor on Adventure mode, normal. Had Assume Bodied Sandworm Queen on first level of the Old Forest. Used the summon talent, which spawned 3 allies properly. When I entered the next level, I saw only a field of black and 3-4 large purpl...