Arcane Armor

A shimmering shield of arcane power engulfs your person. For the duration of the spell, your AC is increased by your Spell Attack Bonus. You cannot be harmed by non-magical weapons and you gain resistance to spells that deal force or psychic damage.

If the spell ends by loss of concentration or if the spell has run its duration, the shield dissipates. If you end the spell willingly before either of the above conditions are met, a shockwave of force energy bursts from your being. Any creature within a 10-foot radius must make a Dexterity saving throw DC15 or take 4d8 force damage, or half as much on a success.