Ethereal Entrapment

A ghostly grey tendril appears and grabs onto a creature you can see within range. The target must make a Charisma saving throw. On a failed save, the creature is pulled into the Ethereal plane and they take 3d8 Necrotic damage. The caster may use their bonus action or reaction to cause the creature affected by this spell to take an additional 1d8 Necrotic damage until the spell ends. On a successful save, the target takes half of the initial damage and the spell ends.

While the creature is affected with this spell, the caster is aware of the movements of the creature and can see them as a ghostly image.

The creature may attempt another Charisma save at the end of their turn. If they succeed, they will return to the Material Plane and the spell ends. The creature may also return to the Ethereal plane is they use a spell that would grant them the ability to become Ethereal, if they use a spell that would allow them to travel to another plane, like the Plane Shift spell, or if they dispel the magic. When the creature returns to the material plane, they return to the nearest unoccupied space available.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th to both the initial spell damage and the bonus action damage..