Wax Quail

The Wax Quail is an unlockable Uncommon item in Risk of Rain 2. While sprinting, jumping will boost you 10 meters forwards. This distance increases by 10 meters for every stack.

Completing the "Going Fast Recommended" Challenge unlocks this item.

The Mercenary extra jump, as well as the one from Hopoo Feather, are also boosted by Wax Quail. These items work well together to increase your mobility.