Temporal Snare

You create a 20-foot cube of fractured time centered on a point you can see within range. The area becomes difficult terrain for creatures of your choice.

When a creature enters the area for the first time on a turn or starts its turn there, it must make a Dexterity saving throw. On a failed save, it takes 3d8 force damage, its speed becomes 0 until the start of its next turn, and it cannot take reactions. On a successful save, it takes half as much damage and suffers no other effect.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 4th.