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According to Whitney, The Maladonia Demon was trapped in a trunk by Professor Statlemeyer years ago by using a dagger to keep him imprisoned in the trunk.
Archie's Weird Mysteries
The Demon first appears when Betty (who was tricked and manipulated by the hunters Prad and Whitney) accidentally freed him by using a silver dagger that served as a key to locking a trunk Betty pulled it out, the trunk opened up, which lets the demon free as this caused Betty to run-away from him.
The Demon wrecks havoc in Riverdale such as dropping a light from the lamp post on Moose Mason (which he dodged in time), stomping on a football, and scaring Mrs. Grundy in a mailbox by ripping up her mail. Later, he chained Prad and Whitney's car bumper to a tree and caused to make it rendered them unconscious as Archie takes the dagger knife out of the lady hunter's vest pocket while she is unconscious.
As the gang went in the Statlemeyer mansion, The Demon chases them while trying to not get hurt by the traps as he ends up getting not lucky from the traps. The Demon went in the trunk as he ends up getting locked up by Betty as she uses the dagger to imprison him.
Although despite trying to steal the dagger. however, it was unknown on what he was going to do with it.