From The Heretic Knowledge Vault
We're not completely sure whether this is a spell or some other kind of magical effect, but anyway:
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According to Meji, if one's "butt (is) looking droopy again or was getting a wrinkle," Rejuvenation treatments fix it. Think of Rejuvenation as magical cosmetic surgery. Apparently it is cast by specialists, presumably some denomination of lifemage.
Meji's mom is the recipient of Rejuvenation treatments, to Meji's obvious resentment. Resent it she might, but the off-story art -- see illustration on the Miyo Hinadori page -- sure makes it look like the thing works.