Teleporter codes

[nyadesune]

So i was blazing through dlc 2 on Normal (lazy yeah) and now boss room requiers 5 codes to open up

so far i found 4
earth - worm nest
water - oasis
fire - somewhere near lighthouse i believe
wood - second one around oasis

any info where the 5th may be?

upd.
nvm the last one metal - industrial zone

[Dozell]

Thanks, I was looking for the wood and earth

[Maledy]

Most of the chests can be spotted from a long distance away. Just run around and look for blue lights in the distance. I think the only one that this won't work for is the one in the Industrial Complex, but I didn't have any trouble finding that one because I was pretty sure they wouldn't pass up putting one of them in there.

I mean they aren't THAT hard to find, since they're all at named locations.

[Marko Torte]

what are the uses for the codes?