I've recently encountered a problem while playing Altar of Reflection: Catalyst. Boss, the Shrieker (Witch's Eye, Keeper of Memory) won't open and consequently is immune to any damage. I've reset who mission and played it many times already but nothing seems to work. I tried solutions like completing the first phase slowly but it doesn't work. Nor it's fault of me not doing rune puzzle in this part of mission, there's simply none showing up. I was close enough for it to open, killed all the other enemies... Anyone has ideas what else can I try?