Howl of the Iron Hound

Uncommon Wondrous Item (Musical Instrument, Horn)
Requires attunement

Hound’s Keen Senses. While attuned to this horn you have advantage on Perception checks that rely on hearing or smell.
Call of the Pack. As an action you can sound this horn. When you do, all allied creatures within 90ft. of you that can hear you gain advantage on all attack rolls against a creature if at least one of their allies is within 5ft. of the creaure and the ally is not incapacitated. This effect lasts until the end of your next turn. You can use this feature twice per long rest.