Ubtao's Grand Maze

You banish a creature that you can see within range into a labyrinthine demiplane, filled with Ubtao's creations. The target remains there for the duration or until it escapes the maze.

The target can take a Study action to try to escape. When it does so, it makes a DC 20 Intelligence (Investigation) check. If it succeeds, it escapes, and the spell ends.  Each turn it is still in the maze the caster will roll a D20 and if they surpass the victim's AC the victim takes 3d4 piercing damage

When the spell ends, the target reappears in the space it left or, if that space is occupied, in the nearest unoccupied space.