A long, slightly curved ivory horn resembling a war-horn.  It is said to be made from the horn of a unicorn and contains magical properties.

As a full-round action, you forcefully blow the horn.  All allies within 50 feet are inspired and have advantage on all saving throws and a +3 to AC for the next 3 rounds (expiring upon the action-taker's 3rd turn following this use).  Because of the force required, the user gains 1 level of exhaustion after blowing the horn.

Requires Attunement. 

Notes: Buff, Instrument