Banishing Smite

5th-Level Conjuration Spell (Paladin)

Casting Time: Bonus Action, which you take immediately after hitting a creature with a melee weapon or an [[glossary:Unarmed Strike]]
Range: Self
Components: V
Duration: Concentration, up to 1 minute

As you hit the creature, your strike erupts with divine power. The target hit by the strike takes an extra 5d10 Force damage from the attack. If the attack reduces the target to 50 Hit Points or fewer, the target must succeed on a Charisma saving throw or be transported to a harmless demiplane for the duration.

While in the demiplane, the target has the

While Incapacitated, you experience the following effects:

Inactive. You can't take any action, Bonus Action, or Reaction.
No Concentration. Your Concentration is broken.
Speechless. You can't speak.
Surprised. If you're Incapacitated when you roll Initiative, you have Disadvantage on the roll.

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

Source: Player's Handbook Playtest 6