Found pretty bad glitch.
During Vulsha's quest, after defeating the Goblin Shaman.
if you leave the village back into the forrest during the investigation for clues and go back in, it resets the encounter before you fought the Shaman, and after the battle the world except the UI goes black. you can still pause and move though.
(note that i was able to restore the world by using a teleport stone and sleeping on my bed. but returning to Vulsha simply resets the encounter and repeats the glitch.)