Fire
One of the four elements: a plane that consumes its own ground, where nothing is kept and everything is changed.
Fire consumes its own ground. Nothing on that plane is kept; everything on it is changed. It is the least survivable of the four elements and the most frequently attested, because the Mól bound more of it than of anything else and the bindings have been failing for a thousand years.
Krelene holds it: the Burning Desire, whose portfolio is love, lust, hate, wrath and passion in one breath. Those who have looked into her plane and come back describe wanting things there with an intensity that did not survive the return.
Beneath the Haudh-Gwenn keep in S3E30, the party worked at a fire crystal set in a brazier until it cracked, and the elemental bound inside came out at them. Koa’s blade passed harmlessly through the flame, so he broke the crystal instead. What was in it went back.