Possible reward from eligible 5-star, 6-star, and selected 7-star Tera Raid Battles. Eligible raid bosses and flavor reward pools vary.
Requirements- Unlock eligible high-level Tera Raid Battles
Repeatable: Yes
Area: Hard difficulty
Possible random reward from hard-difficulty Ogre Oustin' in The Teal Mask. Herba Mystica rewards are random and not guaranteed.
Requirements- The Teal Mask DLC
- Unlock Ogre Oustin' hard difficulty
Repeatable: Yes
Area: Special coach Kofu
Receive three after completing the relevant special coach interaction with Kofu.
Requirements- The Indigo Disk DLC
- Unlock the League Club special coach system
- Complete the required coach interactions
Repeatable: No