Octavien -> inventors -> barrel in waterfront -> octavien again -> tomato something point in arboretun min Rala (Western MH entrance) -> ask about the stone to get the flask of fruiserum -> go to moh, past the colonization reive, in K-8, trade an Ifritite to the Molten rift -> check again for an Ice elemental NM.
XI Wiki


After you clear the quiz, head back to Octavien for the bayld reward and he'll send you to the Barrel again, the taru will take the KI you got from Ohruru and I suppose it's another midnight wait (possibly JP midnight, I'll get back in 30min or so).