Fill the Coated Cerulean Vial at the orange crystal pool in Maraudon.$B$BUse the Filled Cerulean Vial on the Vylestem Vines to force the corrupted Noxxious Scion to emerge.$B$BHeal 8 plants by killing these Noxxious Scion, then return to Vark Battlescar in Shadowprey Village.