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Well, now this IS the wrong section. Someone better move this thing.
Anyway, the system of the game forbids the game to have an optional boss; there are no place you can go on your free will and have some different fight; there are no cards that give you boss or something. So answer is, just like what other people said, no.
I think an optional boss should exist; I mean, they can make a map card like 'Key to hidden' or something like that, and opening that triggers a boss. They should've thought about it.