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I guess I'm stuck now. I somehow lost Pits of Carnage gem. Used the method where
Troll helped me get the gem from Dorstag and I don't know what happened, somehow
I found out I didn't have that gem when trying to get it "treated".

In case it just would've fell to the floor it should be in his quarters, but no.
It also isn't on arena (challenged him to a duel afterwards) Tried looting the floors
but still can't find the damn thing. In case I forgot it on my cursor and entered the big blackrock gem, could it have vanished? Have only 1 older save, at Scintillus academy lvl 8, guess that's better than nothing. Still damn annoying. Any ideas what could have happened?