You speak an arcane command, magically sealing every ordinary exit of a building or enclosed structure you can see within range, provided it fits within a 30-foot cube. Every door, window, hatch, and other exit becomes sealed by invisible magical barriers.
The barriers are completely invisible and produce a quiet metallic clicking sound as they form. Creatures cannot open or pass through the sealed exits by nonmagical means. Teleportation and other magical methods of bypassing the barriers are also prevented, and creatures cannot travel through the sealed exits by any means while the spell remains active.
The spell ends early if you lose concentration, become incapacitated, or dismiss it as a bonus action. When the spell ends, all barriers vanish simultaneously.
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