Helm of the Scream Emperor

A huge, clearly evil helmet that once belonged to the Scream Emperor.

Oh man, you know what the best part of a big evil helmet like this is? It makes your voice sound all echo-y and mysterious! You can get some really sweet reverb on an evil laugh!

Increases AC by 1 and HP by 10. Once per day, allows you to scream at supersonic volume. Each creature in a 15-foot cube originating from you must make a Constitution saving throw. On a failed save, a creature takes 2d8 thunder damage and is pushed 10 feet away from you. On a successful save, the creature takes half as much damage and isn't pushed.

In addition, unsecured Objects that are completely within the area of effect are automatically pushed 10 feet away from you by the spell's effect, and the spell emits a thunderous boom audible out to 300 feet.