Sundering a ring
Ring AC 13, 2hp, hardness 10, break DC 25 (DMG 192)(default material is iron, see PHB 136 for other materials)
Attacking Objects AC = 10 + 8 (size) + 5 (in hand bonus) + wearer's Dex modifier + wearer's magic deflection bonus (PHB 135)
so...AC 23 + Dex + deflection
Keep in...