one
Head to the upper left corner of Hongna Volcano and use a mount or aerial technique to go over and find a boulder at the volcano.
two
Use blasting to break boulders. Learn blasting from Robin at the volcano.
three
Head to the Treasure Cave to fight the guards and defeat the enemies guarding the treasure chest.
four
Claim the treasure chest, the probability of opening a nine-tailed fox to obtain a nine-tailed fox.