Doubling Charm

The Doubling Charm, also called the Duplication Charm and cast as Geminio, copies an object exactly, and the replica is close to impossible to tell from the original. An alternate incantation turns it into the Gemino Curse: the object copies itself without stopping the moment anyone touches it, until the weight of the pile crushes whoever disturbed it. Helixa and Syna Hyslop, reclusive twin witches, invented the charm and used it to duplicate every item in the mansion where they spent their lives together. Their relatives learned of the habit only afterwards, on finding two identical sets of hand-written instructions, one left by each twin.