To become more powerful in Risk of Rain, you need items. To get good items, you need to pencil on the chest. And to open chests you need gold lots of gold. That is, if you can't find the rusty lockbox.
How to Unlock ALL Artifacts in Risk of Rain 2 (ALL CODES & LOCATIONS)
In Risk of Rain 2, your power depends mostly on the items you have collected. Chests serve as the best source for these, but opening them requires some gold. But there is one type of chest that you can open for free: the Rusted Lockbox.
Like all items in the game, the Rusted Lockbox is randomly scattered on the map, but in order for it to appear, you must first complete a specific challenge, called Keyed Up. It requires you to kill a teleporter boss in 15 seconds or less, which can be done with damage boosting items and some skill.
Once you complete the challenge, the Rusted Key will start spawning randomly in stages. It's a common item, so you shouldn't have a problem finding it. Once you have it in your inventory, every step you take with it will have a rusty lockbox hidden somewhere.
