Its not a prank. If you talked to the enemies before you killed them, and passed the charisma checks, she tells you that the wand was made through tenebrium and that one risks rot by using it.
Unfortunately winning rock paper scissors isn't something you always do.
That's another thing actually, I swear the rock paper scissor game is rigged. I never EVER get any draws with NPCs, I either win or lose. This particular encountered they had 5 charisma points, meaning I would never know about this rot wand if I lose more than twice.
