Soulless Sphere

You summon a veil that protects you and your companions from undead creatures. Any undead that looks at your direction or a space that falls within the sphere around you must succeed on a Wisdom saving throw or they detect you as undead creatures. Undead with 13 or more Intelligence are immune to this effect. Any magical effect or feature that determines your creature type renders you as undead. However, this doesn't mean they will not be hostile towards you; it is the GM's judgment.

At Higher Levels

If you cast this spell using a 3rd level or higher spell slot, the Intelligence limit becomes 15; if you cast it with a 5th level or higher spell slot; it becomes 17, and if you cast it with a 7th level or higher spell slot it becomes 21.