The Ring of Oath is a crucial key item in Elden Ring that’s required to complete Ranni's questline and access a blocked area. Most players have likely encountered a barrier in the underground region, Lake of Rot, after killing Astel, Naturalborn of the Void. The requirement to pass through the fog is to have the Ring of Oath. However, Elden Ring doesn’t have an item called the Ring of Oath, so what is it really?
The Ring of Oath is actually the Dark Moon Ring, and it symbolizes a cold oath made by Lunar Princess Ranni. It is said that the ring is supposed to be given to Ranni’s consort. Additionally, obtaining the Dark Moon Ring is important for players wishing to have the Age of Stars ending.
Elden Ring: Ranni Full Quest Walkthrough
The Ring of Oath or the Dark Moon Ring is in the Raya Lucaria Academy northwest of the Debate Parlor Site of Lost Grace, Liurnia of the Lakes.
From the Debate Parlor, which is also Red Wolf of Radagon boss' room, head out and advance to the large broken stairs. The only way to climb them is by walking on one of its side bridges.
Jump on the one in the middle, then over the railing, and escalate the stairs. Be careful as there’s a moving sphere trap that’ll cause heavy damage on contact.
Dodge it and move to the northwest through the open doors. Waiting up ahead is Moongrum the Carian Knight; defeat him, then take the elevator behind the enemy to reach the Grand Library of Raya Lucaria, where the chest is located.
As mentioned before, the Ring of Oath, aka Dark Moon Ring, can be found inside a chest in the Grand Library of Raya Lucaria Academy. The chest is in Rennala, Queen of the Full Moon’s boss' room.
It’s only accessible after defeating the Sharbearer. Upon defeat, Rennala moves to the center
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