Board Thread:Lore Discussion/@comment-5632187-20130209000209/@comment-84.170.129.146-20130912012406

Well the dark of the abyss is what damaged the armor of artorias, and the dark of the abyss is what grasping the floor and walls up to oolacile its a progress which is going to bring totaly darkness, not a black whole that soaks all light instantly.

I think the darkness destroys Oolacile slowly until only darkness remains, thats the reason you cant see any ruins of Oolacile in the present.