Defeat Plateau Gurus near the Polluted Plains to collect GuruShells. Afterwards, speak to Merchant Chase at the Great Hessian Tree. Use your quest tracker to see your progress.
Merchant Chase: Before all of this mess, people only came here to give Merchant Chase: prayers before. Now the tree is filled with soldiers and Merchant Chase: military people! Hahaha! HiiragiKagami: We're not here for a good reason. Why are you so HiiragiKagami: excited? Merchant Chase: Hahaha! I'm sorry. Well, it's way better for me to Merchant Chase: sell goods to soldiers or Aitan than to sell candles or Merchant Chase: lamps to other visitors. Why not be excited? HiiragiKagami: You'll make a lot of money this time! Merchant Chase: Don't tease me! People who belong to the Scorpion Merchant Chase: Camp need to give a certain amount of profit to the Merchant Chase: Congress. We're people working for the good of Lakia! NakanoAzusa: I see. Merchant Chase: Soldiers ruin their armor pretty quickly from battling so Merchant Chase: much. Granted, tough skin is high in demand! It's Merchant Chase: difficult to secure enough supplies for the blacksmith Merchant Chase: because leather is used in all equipments, you know! NakanoAzusa: Even this place doesn't have supply coming from NakanoAzusa: Regenshein on time. Merchant Chase: Just like the oasis! It's all because of the cabritos who Merchant Chase: turned violent. They even took over our camp! NakanoAzusa: Oh boy... Merchant Chase: If tough skin is not supplied properly, it becomes too Merchant Chase: difficult to repair or sell equipment. But there will Merchant Chase: be a road if you seek one! The skin of some gurus who Merchant Chase: moved into the area is substituting tough skin. Get some!