Disenchanter
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Disenchanters are an obscure Gotcha Monster from Dungeons & Dragons, that exist to basically be unto wizards what Rust Monsters are unto fighters.
They're old-school: starting in White Dwarf's first Fiend Factory run, and entering the Fiend Folio. Paizo ported them into Pathfinder.
They resemble thin camels with 5ft long elephant-like trunks and covered in pale electric-blue fur, and their sole diet is magical energy, which they siphon up through their trunk-tips. In battle, they attempt to go after the most powerful magical item they can sense first, seeking above all else to touch it with their trunk so they can sap its energies. Casting spells at them is risky, because if they can intercept the spell with their trunk, they absorb it too. They can also drain "standing" magical effects like illusions or curses as well. What makes them even more annoying than rust monsters is that, whilst they can suck the magic out of magic weapons if they hit them first, they can't be hurt by non-enchanted weapons.
Nobody found much for Disenchanters to do in (say) Greyhawk, and the BXCMI didn't touch 'em; so they got retconned as native to the Forgotten Realms. On Golarion, Disenchanters were created as a living weapon in the feud between the powerful mage-lords Nex and Geb.
Gallery
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The original.
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1e
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Module FOR8
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2e
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3e
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Pathfinder