Time Trap (5.5e Patch)

You place a snarl in time in an empty a 5-foot cube. The first time a creature enters the square, it must make a Wisdom saving throw. On a failure, a Medium or smaller target has the Stunned until the start of its next turn, while a Large or larger creature has the Restrained condition for the same duration. On a success, the creature's speed is halved instead. Once activated, the trap does not activate again and the spell ends at the start of the trapped creature's next turn.

The trapped area is subtly distorted, and any creature that can't see the area at the time the spell is cast must make a Wisdom (Perception) check against your spell save DC to detect the trap.