Dimensional Duel

You attempt to draw a creature into a duel on another plane. One creature that you can see within range must make a Charisma saving throw. On a failed save, you are both transported to a demiplane in the shape of a circular arena 60 feet in diameter. You always start at the center of the arena, and the target starts the same distance away from you that they were when you cast the spell. When the spell ends or one of you falls Unconscious you are both transported back to the spaces you were in when the spell was cast.