Pliamus’s Peculiar Percolator
The wizard Pliamus once made a magical percolator so he could have coffee whenever he liked without having to stop and make a fire. When the trigger word was spoken (“Percolate!”) any water within the percolator begins to boil.
Pliamus didn’t bother to tie down the magic on the device too tightly, as it was a simple container and unlikely to cause any serious trouble if it malfunctioned.
After dropping it on a fishing trip and accidentally turning the Lake of Novel Flumes into the Mourning Dust Bowl, Pliamus decided to ditch the thing. He chucked it in a volcano, which we all know messes up magic, and went home.
The percolator was magic-tough though, and is now lodged partway up the side of the volcano, half submerged in obsidian. The lid, tube and ground-holding apparatus are lost for all time, leaving what looks like an ordinary but strangely tall pot.
I like this one. Without an indication of what it’s for, but BEAMING out magical energies, a party could misuse it for all kinds of things. Or figure it out and use it when making camp as a pot. Or chuck it in a small lake or river to create enough fog to conceal an advancing army. Or fight water elementals with it. Or….