Backup Magazine

The Backup Magazine is an unlockable common item in Risk of Rain 2. It allows for the players second skill(mouse 2 by default) to store an additional charge per stack. Completing the Flawless Challenge unlocks this item.

While this is a straightforward upgrade for most characters, the Engineer can already hold 10 charges on their Pressure Mines, and each stack just increases this amount by one.

The Artificers Charged Nano-Bomb fires automatically when it gets fully charged, and if the button is kept down the second charge may start charging before you release it. This causes the next Nano-Bomb to launch with barely any power.