Shatter Shield

When worn, a shatter shield grants +2 to AC like a regular shield. It has 3 charges. Whenever you are attacked, the shield loses a charge. If the last charge is expended, the glass shatters in an explosion of razor sharp magic glass. All creatures within 10 feet of the explosion, you included, take 3d6 magical piercing damage. If you retain at least one of the shield shards, you may complete a 1-hour ritual every day for the next 7 days to reform the shield.