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Freezing Cloud Launcher (4e Trap)
From D&D Wiki
A magical object taking up one square, such as a pillar with a clear orb containing a small cloud mounted on it, that fires a pellet that explodes into a cloud of icy mist at the point of impact. Once the pillar is destroyed the orb will fall and crack, harmlessly shattering into worthless glass. The Trap attacks any creature that come within it's range (10 squares) unless it has been enchanted to not attack them.
Players can make an Knowlage Arcana Check, DC 15 to identify it when they see it.