Chaos Shield

You infuse the spells of those who dare attack you with the randomness of pure chaos. The caster of the spell that triggers your reaction must make a Constitution saving throw. On a failure, the spell goes wild, and the caster must roll on the Chaos Surge table to determine the effect. Additionally, the caster becomes glitched for one minute. While glitched, each time the caster casts a spell using a spell slot, there is a 50% chance the spell goes wild. An affected caster can repeat its saving throw at the end of each of its turns, ending the effect on a success.