Btw. I opened pretty much all chest in game, except that one in Eternal maze..
It's can't be opened, there is just no keys left in the location (I've checked the script).
And, I finished game with like 12 keys left.. wierd, huh?
No? Some chests can be opened via lockpick EVEN if there is a key for them.
Btw. any way to open Lovis armor chest, except solving his quest? I simply hate him too much..
No.
