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I'm assuming you're talking about the boss at the end of the snake clan cave? If so the treasure in the last room is decorative, you can't take it because it's stolen from other people. The characters should've suggested you go back to Oasis to report it, after which you'll get a reward. I'll consider making this clearer in future versions.

Report where? TYSM. 

The second floor of the witch tower in Oasis.