Concussive Blast

A blast of concussive force emits from your hand, knocking anything away from your palm, make a melee spell attack, on a hit the target takes 1D8 force damage, if the target is an object the object takes maximum damage. If your attack roll lands on 1, the blast backfires, and you take the damage instead

this spell’s damage increases by 1d8 and failure chance increases by 1 when you reach 5th level (2d8 damage, failure at 1 or 2), 11th level (3d8, failure at at 1, 2 or 3), and again at 17th level (4d8, failure at 1, 2, 3 or 4).