Oolacile Sanctuary is a special DLC Location in Dark Souls, and included in the base game with Dark Souls Remastered. After defeating the Sanctuary Guardian, you'll make your way into here; the Oolacile Sanctuary is a simple location with only an NPC and item. This is a bonfire for the Artorias of the Abyss expansion - and an optional area in the game.
Oolacile Sanctuary Map
(Work in progress)
NPCs in the area
Full Oolacile Sanctuary Walkthrough
Getting to know the locals
After defeating the Sanctuary Guardian, find the doorway and continue in to end up in this Graveyard-like area containing only one loot-able corpse with 1 Humanity. There is also a bonfire in the middle of the sanctuary. There won't be another bonfire for a while, after a field of relatively tough enemies and a difficult boss fight, so you may want to kindle this one.
Elizabeth, the only female mushroom-person and inhabitant of this area, can be seen from the bonfire. She sells the spells of Oolacile and other items, and will ask you to save Dusk once again. If you succeed in your quest, she will reward you (visit her page for more details).
Notes & Trivia: