Hogyoku and Hogyoku's Will are rare and vital materials used for ascending 5-star characters to 6-star, and for unlocking the final stages of a 6-star character's Soul Tree. They are primarily obtained from various Event Quests, Co-Op Quests, and sometimes as login bonuses. Always keep a stock of these materials, as they are a bottleneck for character progression. Prioritize using them on your most powerful and versatile characters.
