What is the rusty key

[MrNobodyX3]

I keep finding this key item that roughly says a key for unlocking Rusty boxes filled with treasure

[Balmert]

In every level there is a little box on the ground, it's very hard to see, you get an item inside.

[Draco18s]

Its easiest to find during the portal activation, as it will get the red glow of "can't touch this" during that time.

The best part about it is that EVERY future level will have a rusty lock box in it (somewhere). So for the cost of 1 white you get a white (or better) item on every future level. Which is still mediocre when you have to (a) find it and (b) have enough levels to make the delayed cost worth it, but in the current (non-Prismatic) game works out to "pretty good."

[Tsvetomir]

Originally posted by Balmert:

In every level there is a little box on the ground, it's very hard to see, you get an item inside.

If I get 5 keys, there will be 5 black boxes on each level?

[Daxy]

Originally posted by Tsilliev:

Originally posted by Balmert:

In every level there is a little box on the ground, it's very hard to see, you get an item inside.

If I get 5 keys, there will be 5 black boxes on each level?

There will still be a single chest, but the chances of getting better loot (green and red items) increases.

[Thez33kr]

I always seem to get very unlucky with the key, but even with 12 to 15 keys during long runs there are more whites than greens.

Sure i dropped a legendary once or twice, but i really dislike the key... not to mention that those boxes are a ♥♥♥♥♥ to find.
You gotta invest the time...

[screeno42]

You basically need the item locator equipment. The box the rusty key spawns for you is tiny and easily blends in with most terrain.

[Lunacy]

When you open a rusted lockbox:
80 loot points to get a white item
#keys x20 loot points to get green item
#keys x^2 loot points to get a red item
so if you have 10 keys (80/200/100) you have 80/380(21.05%) for a white, 200/380(52.63%) for a green item, 100/380(26.32%) for a red item.
20 keys is (80/400/400)9.09%/45.45%/45.45%

It basically gets you a free chest in the next level if you can find it, and the chance at greens and reds becomes better the more keys you or your team has.

1 key is basically a free regular chest
4 keys is a 45/45 to get a white or a green
20 keys is a 45/45 to get a green or a red

Also it's basically a really tiny brown shoebox.

[Thez33kr]

Thank you Lunacy, that helps