Wondrous Item

Uncommon Requires Attunement

(requires attunement by a bard)
  When a creature adds one of your Bardic Inspiration dice to an attack or damage roll, and they hit a target within 60 feet of you, you can play the shawm as a reaction to deal thunder damage equal to one roll of your bardic inspiration die to the target. 
 Additionally, you can play the shawm as an action to cast thunderwave, shatter, or lightning bolt, and that spell can’t be cast from it again until the next dawn