okay, this one is pretty weird, so I could be wrong about what just happened, but I think it was
step 1: PoDuplication + AoUndeadification -> AoUndeadification + AoUndeadification
step 2: PoDissolution + AoUndeadification -> Amulet + PoAbsorbedUndeadification
step 3: PoAbsorbedUndeadification + Lump of Mud -> PoAbsorbedLifeIncrease
which all makes sense, but then I checked my inventory, and the original AoUndeadification that I duped and dissolved the copy of is now an AoLifeIncrease. Wacky.