Thundering Armor

You infuse a creature's armor with pulsing energy, increasing its protection and knocking a single foe away with an intense reverberation. Choose a friendly creature within range that is wearing armor. The subject gains a+2 bonus to AC until the end of its next turn. You can also choose a hostile creature within 5 feet of the ally. That hostile creature must make a Strength saving throw. On a failed save, it takes 2d8 thunder damage and is pushed 10 feet away from your ally. On a successful save, the target takes half the damage and is not pushed.

You cannot cast this spell on yourself.

At Higher Levels. When you cast this spell using a spell slot of 2nd-level or higher, the thunder damage increases by 1d8 for each slot above 1st.