Elden Ring: All Lore Related to the Frenzied Flame

gamerant.com:

The Lands Between in Elden Ring may seem abandoned by any gods, but the truth is that there are Outer Gods that influence what they can. The most well-known of these is the Greater Will, which basically took over the Lands Between long ago with Marika as a stand-in ruler. However, there are other lesser-known Outer Gods that exert minor influence.

Aside from the Greater Will, there is the Formless Mother, the God of Scarlet Rot, and the Frenzied Flame. Among them, the Frenzied Flame is special, because it is one Outer God that the Tarnished can ally with. It unlocks the «Lord of Frenzied Flame» ending. What is known and uncovered by fans about this Outer God is pretty fascinating, as it seems to be in direct opposition to the Greater Will.

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The Frenzied Flame is far less present than the Greater Will, but it certainly does have an influence on the Lands Between. While the Greater Will establishes law and order, the Frenzied Flame is all about chaos and madness. While it is opposite to the Greater Will, though the two Outer Gods seem to be connected. The Greater Will uses the Two Fingers to spread its will, while the Frenzied Flame has the Three Fingers. Together, that makes a full hand of five fingers.

Due to this commonality, a widely believed theory is that the Greater Will and Frenzied Flame were once one Outer God that split into two. This would be long before either of these Outer Gods came to the Lands Between. Hyetta has a quote that hints that this theory could be true, as she says, «All that there is came from the One Great.» In terms of when the Frenzied Flame came to the Lands Between, there is one item description that talks about this. The incantation,