Bandolier

The Bandolier is a new item in Risk of Rain 2.

Upon pickup, it gives enemies a chance to drop an Ammo Box on kill, which refreshes all skills currently on cooldown as if they were never used. For example, if the player is using Huntress and has just used a skill such as Ballista, instead of waiting for the 12 second cooldown they can just collect an ammo box and instantly regain the ability to use the attack.

For skills that have multiple charges, such as Engineer's turrets or secondary skills with, Bandolier will only refresh one charge and the next charge will start from full cooldown, wasting any natural cooldown. This also applies to, despite the skill granting full charges if allowed to cooldown normally.

The drop chance is affected by.

Math
The chance to drop is determined by the formula