Rallying Horn
Wondrous item, rare (requires attunement by a fighter)
While the horn is on your person, you regain an extra 1d10 hit points whenever you use your Second Wind class feature.
The horn has a number of charges equal to your proficiency bonus, and it regains all expended charges daily at dawn. As a bonus action, you can expend 1 charge to blow the horn and emit a rallying call. Each creature of your choice (including yourself) within 60 feet of you that can hear you has advantage on the first attack or ability check it makes before the end of its next turn. Additionally, each chosen ally can use its reaction to either move up to its movement speed without provoking opportunity attacks, end the frightened condition on itself, or regain 1d10 hit points.
The legendary prowess of Barut warriors is due to their herd mentality. When charging into battle, they rally their forces with horns of war. Alone, a warrior may be formidable, but together they are unstoppable.