only way to find out is to try it.

XSTRONG wrote: »

What do you get from those Keys? I didnt know they existed

you can open treasure chests with the keys in the vault in Scrivener's Hall which is near the room where you fight the first group of enemies.

the chests can contain furniture and if you open 20 you're guaranteed to spawn the secret boss.
the boss gives a map tool that shows you where the cartoklepts are

cartoklepts drop the keys. there's two each time you go through the dungeon.

in the Deadlands area they're in green caverns and in the Spiral Skein area they're behind webs that you can burn by interacting with the webs.

colossalvoids wrote: »

Is there that many chests total? Max we've done was all the big ones as we had purple keys from achi prog and couple small ones, which didn't changed anything really.

There's 20 Large chests and 20 small chests.

the annoying part is a lot of the furnishings from those chests are bound, except for the vault door, but i havent seen it confirmed if it was a bug or not

ive gotten at least 3 of the extra long mora banners (which are really freaking tall) but were bound so i couldnt give them to my girlfriend or sell them