Banishing Smite
The target hit by the attack roll 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 there, the target has the Incapacitated condition. When the spell ends, the target reappears in the space it left or in the nearest unoccupied space if that space is occupied.
Banishing Smite 5.5e 2024 vs. 5e 2014 edition differences
The 2024 version changes the spell's school to conjuration, specifies the target hit by the attack roll, requires a Charisma saving throw for banishment, and states the target is incapacitated while in the demiplane. The 2014 version automatically banishes if the target drops to 50 HP or fewer without a saving throw.