Deal +10 blunt damage with your hit with Arcane Punch.
Then the target must pass a health save, or you may launch them up to 10 ft. up into the air.
If they fall 10 ft. or more, they will normally take 1 fall damage per ft. they fell when they hit the ground.

Falling:
A creature falls up to 500 ft. per round, at the end of its turn.
At the end of a fall of 10 ft. or more, a creature takes 1 blunt damage for every foot that it fell, up to a limit of 500 damage.
A creature which takes 100 or more damage from a fall may instantly die at the Headmaster’s discretion.
A soft landing area or other mitigating factors may reduce this damage.

Suggested Backfire: You take 10 blunt damage and are launched 10 ft. into the air and up to 30 ft. in a direction of the Headmaster’s choice.