Air Cannon

     »Your arm expands to create a well of pressurised air. Make an attack by aiming your arm in the direction of the intended target and take 1d4 damage due to expansion of your arm. On hit, target takes 1d6 bludgeoning damage and makes a strength saving throw or be knocked back 5ft.
»Special:
This spell gets more powerful the longer it is charged 2 turns (2d6, 2d4 +5ft), 3 turns (2d6 +6, 3d4, +5ft), and 4 turns (3d6+6, 3d4+4 damage +5ft) 5 turns, (3d6+12, 4d4+8 damage and +5ft) if the spell is shot at charge 5 then you spend your action next turn recovering. If the spell is not shot in 5 turns, take the 5d4 at Max damage and roll a constitution save of your spell DC or be stunned for 1 turn