Talk:Deacon Set/@comment-37097869-20190409112836/@comment-4511886-20190409124807

It possibly implies that the cathedral was used to stop the dark at first. I'm not sure if this is confirmed or hinted at somewhere else, though. The other idea is that it is a direct reference to the Abyss Watchers.

Oolacile didn't actually seal away Manus at any point. He was just there, and then they sought his power, which eventually caused the Abyss to appear.