Assuming that they bring forth a place of power or somehow get Erisu to a place of power, they also need a ritual to dispel him. The characters might already have a ritual of dispelling, the one from Illustrious Castle. If so, those words will work fine—but the symbolism will need to be Erisu’s symbolism.
If they find Elizabeth Mardel’s ritual of dispelling, that will work also, assuming they’ve been through enough to believe that the tree is a real force in the world along with Christianity.
If they have to make one up themselves, that’s also fine. The important bit is the symbolism—the actual sigil of Erisu and the secondary symbols in the circle—and calling on greater powers that not only exist but that the characters have some connection with.
If Erisu escapes, remember that rituals can be performed if they have something “deeply attached to” the target. Melody’s ghost is deeply attached to Erisu, because Melody was how Erisu was summoned.
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