Undead Paralysis

Choose an undead that you can see within range. The target must succeed on a Wisdom saving throw or be paralyzed for the duration. This spell has no effect on undead with a challenge rating of 6 or higher. At the end of each of its turns, the target can make another Wisdom saving throw. On a success, the spell ends on the target.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you can target a creature with a challenge rating of 2 more for each slot level above 3rd.