Vengeful Wrath

When you get hit for 15+ damage by a single hit, you can use your reaction to send forth waves of psychic energy. The waves deal an amount of d8 psychic damage equal to your Proficiency Bonus to every hostile creature in a 20 foot radius centered around you. Each creature hit must make a separate WIS save. The DC equals 10 + your PB + your WIS modifier. On a succes, the creature takes half damage. On a fail, the creature takes full damage and has disadvantage on every save, check and attack roll using Wisdom for the next of minute. The creature who provoked your reaction makes the initial save with disadvantage.

You can use your Vengeful Wrath once per long rest.