Regular Violence

Every one of your strikes is a drumbeat punctuating the rhythm of battle. Starting at 3rd level, when you hit a hostile creature with a weapon attack while raging, your rage damage bonus increases by 1. This bonus cannot exceed your half your barbarian level, and lasts until you miss an attack or your rage ends.

Furious Footwork

Beginning at 6th level, you gain proficiency in drums and your choice of Acrobatics or Performance. You can stand from prone using only 5 feet of movement, and when you Dash you ignore difficult terrain or any penalty to your speed when unless your speed is 0.

Battle Beat

Starting at 10th level, you can use a bonus action while raging to make an uproar that thrills the hearts of your allies. Friendly creatures within 60 feet of you that can hear you have advantage on saving throws to avoid being charmed, frightened, exhausted, or put to sleep until the start of your next turn.

When you take this bonus action, you can choose to inspire affected allies. Once before the start of your next turn, each inspired ally can add your Constitution modifier to one ability check, attack roll, or saving throw it makes. It can wait until after it rolls the d20 before deciding to use the bonus, but must decide before the DM says whether the roll succeeds or fails. Once the bonus is added, it is lost. A creature can have only one bonus at a time. You can grant this bonus a number of times equal to your Constitution modifier (a minimum of once) and regain expended uses when you finish a long rest.

Staccato

Beginning at 14th level, the sound of your mighty blows sends a shockwave bursting through other targets. When you hit a creature with a melee weapon attack, all creatures of your choice within 5 feet of the target take thunder damage equal to your current rage bonus.