The Rusted Keys multiply the chances of getting an Uncommon tier item by the amount of keys the team has. After choosing the rarity, it chooses an item at random from all available items from that tier. Then the chest, during its creation, uses this weight selection to select the rarity of the item.
To understand how the Key affects the chance on a specific rarity of item, one first needs to understand how a normal chest chooses an item: A normal chest has 80 chances for a common item, 20 for an uncommon item and finally 1 chance for a Legendary item. The key is not consumed upon opening a Rusty Lockbox, and losing the key using a 3D Printer will not prevent the Rusty Lockbox in that level from being opened. This item is unique in the fact that it doesn't modify the current stage and is quantified by all keys among the team rather than an individual. Whenever a new stage is entered, a Rusty Lockbox will spawn with the rarity of the contents based on how many Rusted Keys the entire party had when entering the stage. The Rusted Key is a new item in Risk of Rain 2. Special: Additional items increase the effect using a unique formula specific to the item
1/x)Įxponential: Additional items multiply the effect by a fixed amount Hyperbolic: Additional items increase the inverse of the effect by a fixed amount (i.e. Linear: Additional items increase the effect by a fixed amount
