Dead as Disco

Dead as Disco.
While active you and every creature within the emanation hear a song, you subconsciously follow the beat with your strikes getting more and more empowered with each successful strike.

Upon activation you and every creature in a 120ft emanation are surrounded in a black sphere (120ft wide 60ft tall), Any creature can attempt to enter but when inside it is nearly impossible to exit until the effect has ended.
While within the sphere any melee attack you make with a d20 roll of 11 or higher adds an additional 2 damage dice, with an additional dice with each successful attack.
If you miss an attack the counter gets reset.
You also gain advantage with all melee attacks while affected with this spell, and immunity to the Deafened condition