Thorns of Țepeș

Thorned stakes shoot out of the ground in a 20-foot cube starting from a point within range. For the duration, these stakes turn the area into difficult terrain.

A creature in the area when you cast the spell must succeed on a Dexterity saving throw or take 4d4 piercing damage and be restrained by the thorned stakes until the spell ends. A creature must also make the saving throw when it moves into the area for the first time on a turn or ends its turn there. A creature restrained by the stakes can use its action to make a Dexterity check against your spell save DC. On a success, it frees itself.

When the spell ends, the conjured stakes rot away.