The Frenzied Flame is something many players might not come across in multiple playthroughs of Elden Ring. The Three Fingers whose embrace holds the frenzied (and the future Lord of Chaos) in its thrall is found deep, deep below Leyndell. Inheriting this heretical, destructive, maddening flame unlocks a new ending that plunges the world into an Age of Chaos.
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It's also the only Elden Ring ending that locks you into a choice – other unlocked endings can be selected interchangably after beating the final boss, but if you inherit the Frenzied Flame you are doomed to destroy the world… well, that's not entirely true, but in order to undo the Frenzied Flame, you will have to complete a lengthy NPC questline and defeat one of Elden Ring's hardest bosses.
Millicent is a red-haired NPC who players find for the first time in the Church of the Plague in Caelid. Gowry will hint at her location if you find him first, and after talking to Millicent return to Gowry, who will give you some more information on Millicent's condition send you to find an item that can help her overcome the Rot.
This item is the Unalloyed Gold Needle, the same item you will use much later on in the game to undo your choice to inherit the Frenzied Flame. For now, head towards the Swamp of Aeonia and search for a boss named Commander O'Neil.
Commander O'Neil is not a particularly tough boss fight, though you don't fight him one-on-one. He constantly summons mobs to shoot and chase his target, though the ability to ride Torrent makes this boss and his cronies much easier to overcome. Once downed, Commander O'Neil drops the Commander's Standard and the Unalloyed Gold Needle.
Return to Millicent and give her the needle to begin the process
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