As a Bonus Action, you begin to throatily sing a terrifying (to your enemies) song of War, Death and Destruction to your foes. While War Song is Active, all allies within 45' of you have Advantage on Ranged and Melee Attacks. Your War song lasts up to 1 min as long as each turn you use your Bonus Action to continue singing it.

At Character Level 5 - War Song Duration increases by 30sec.

At Character Level 10 - War Song Duration increases by 30sec.

At Level 15 - War Song ties your ally's souls to you and the battle field, all Allies within 30' have Advantage on Death Saving Throws.