Deliver William’s potion to Illos, who is doing research in the forest.
Step 1. Take the potion to IllosAn assistant researcher who studies the ecology of Southern Tolbas Forest with Geolus..
Step 2. Take the remaining potion to RoseinoA Guardian protecting the Contaminated Swamp in Verteron. She is a capable and dedicated soldier who fervently studies the cause of the contamination. Despite her average looks, she is popular among the men in the neighboring village..