So I've been searching round the web, seems there isn't much info on this place, just a few people having some trouble with a few chains. Anyways, in the last room of Shriekwind Bastion there is a room with two little pillars, one with a potion on top of it, after removing said potion it becomes clear that it is in fact a pressure plate, both pillars are. The problem is, the second one is poorly placed, so I can not get an item to sit on top of it, there is an invisible wall in the way. That being the case, I can't activate both pressure plates and then go look to see what they do.

Anyone have idea idea what these things do?