Ice Jet (4e Trap)
From D&D Wiki
A hidden nozzle lets loose with a blast of freezing air. The trap is triggered and rolls initiative when a character ends his or her turn in the blast area of the jet. The jet attacks on its turn every round.
Many dungeon-builders install two ice jets near each other. When one jet activates, roll initiative for both jets; each acts on its turn every round.
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