Elemental Barrier

You tap into the 4 elements and summon a multi layered barrier of either Rock, Water, Fire or Comperessed Air or a combination of the 4. The barrier provides a +3 to AC no matter how many layers are up.

Depending on what elements make up the barrier you gain resistance to Fire = Fire Damage, Rock = Bludgeoning, Piercing and Slashing from non magical attacks, Water = Cold Damage, Compressed Air = Force Damage. 

Each layer of the barrier counts as a charge for its offensive ability, while you have the barrier up you can expend 1 layer/charge to as a bonus action to convert 1 layer of the barrier into a energy blast targeting 1 creature within 60ft of you dealing 1d6 (fire, cold, bludgeoning or force damage), alternativly after you are hit but a melee attack you can expend 1 layer/charge to as a reaction deal 1d6 (fire, cold, bludeoning or force damage) to the attacker.

AT HIGHER LEVELS: When casting this spell at 5th level or higher you can summon 1 additional layer per spell slot level above 4th. When casting this spell at 6th level damage increases to 2d6, at 8th level damage increases to 3d6.