Warding Rune Against the Dead

You scribe a complicated rune on a surface, whether by drawing with ashes, carving with a knife, or tracing with blood. This rune has no special visual qualities, and is nearly imperceptible although a successful Intelligence check (Arcana) check against your spell save DC  allows them to to notice it and recognize its actual power (intelligent undead may actively avoid such wards). When an undead creature approaches within 10 feet of the rune, it begins to glow with a, blood-red dim light. This provides dim illumination for 10 feet around the rune.

An undead creature must succeed on a Wisdom saving throw against your spell save DC to enter the illuminated area, and is affected as if it has been subjected to a Channel Divinity: Turn Undead (Cleric class feature}. If the creature fails its saving throw, it takes it 4d6 radiant damage, save for half damage and it is turned for 1 minute and must leave the area of effect. If it takes any additional damage it may repeat another attempt to re-enter the area)

Note: If the Undead enters the area or starts its turn there, it is still subject to the Radiant damage and repeating the saving throw. If the rune is defaced or the surface it is on is destroyed or moved from its original spot, the spell immediately ends. Because the rune barricades a small spherical area, it is most frequently used to bar passage by the undead in narrow hallways or through doors or windows or to ward a specific location. The spell may only target a specific area and is immobile once created

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the area of effect is increased by 10ft and the damage inflicted in the rune’s light increases by 1d6 per spell level.