Tombstone Ward

You inscribe a magical rune onto a tombstone or similar object, creating a ward that protects the resting place of the deceased. Indefinitely, within a 30-foot radius of the tombstone is under the effects of the hallow spell, and undead creatures cannot enter or pass through the area. Any undead creature that does somehow make it within the area, takes 3d8 radiant damage and is ejected from the radius. 

Casting this spell at 4th level or higher increases the damage by 1d8 per level above 3rd.