War Horn

War Horn is a new item in Risk of Rain 2. It increases attack speed by 70% for 8 seconds, with an additional 4 seconds per stack, upon activation of an equipment indicated by a distinct "ting" sound.

Synergies

 * Collecting this item in conjunction with a low-cooldown Equipments,, and multiple  can allow you to keep the bonus indefinitely.
 * with only Gesture of the Drowned will allow you to keep the attack speed bonus without any fuel cells.