Arcane Armor

You touch a willing creature who isn't wearing armor. A protective magical armor with a look of your choosing surrounds the target until the spell ends. The target's base AC becomes 15 + its Dexterity modifier.

As a bonus action, the target may choose to dispel the armor in a massive explosion of force energy. When dispelled in this way, all creatures within 5 feet of the target must make a Strength saving throw or be pushed back 10 feet. This event triggers no opportunity attacks