Approach it and Dark Sun Gwyndolin will offer you entrance into the Blade of the Darkmoon covenant. Wearing this ring in front of the Gwyn statue located in the Darkmoon Tomb bonfire room in Anor Londo will reveal a passage leading to a fog door.
The Darkmoon Seance Ring is identical to the White Seance Ring in this regard the two can be worn at the same time for two additional attunement slots in total. The Darkmoon Seance Ring grants one additional Attunement slot. The path out of the room also leads to a ladder leading to the Tranquil Walk of Peace miracle and a hidden shortcut to the room where the second necromancer is found. Pillaged off a corpse in The Catacombs, in a coffin not too far past the 1st fog door (after the 2nd switch bridge), hidden in a large room behind a breakable wall (indicated by a developers' message reading 'Treasure'), and guarded by a Giant Skeleton. His followers are few, but their tasks are of vital importance. The Dark Sun Gwyndolin is the only remaining deity in Anor Londo. (Thanks kalsbkeo ) I believe the witch's hat also increase attunement slots by one, making the maximum amount of slots 14. Grants additional magic and attunement slots. EDIT: Currently the max I've discovered is 14 with 75 Attunement, the Southern Ritual Band +2, and the Black Witch's Hat. In-Game Description This ring is granted to adherents of Gwyndolin, Darkmoon deity and last born of Gwyn, Lord of Sunlight.
