Rusted Key

The Rusted Key is a new item in Risk of Rain 2.

Whenever a new stage is entered, a Rusty Lockbox will spawn for each player carrying a Rusted Key. The rarity of the contents equivalent to a Large Chest. The key is consumed upon opening a Rusty Lockbox.

Rusty Lockbox will spawn even if the is enabled (which disables chest spawn).

This item is unique in the fact that it doesn't modify the current stage.

The Rusted Key behavior was dramatically changed in the 2021 Anniversary Update