This is an event wherein you use "Spirit Stamina" to challenge an enemy led by a powerful boss.
During the period, a dedicated icon will be displayed at the top of the home screen.
Depending on the damage given to the enemy party, you can get Rank Points and Immortals Medal.
Rank points are aggregated by Ranking and you can get rewards according to your Rank after the event.
Immortals Medal can be exchanged for items at the special shop during the event.
・Immortals Medal is valid only during the event period and cannot be carried over to the next event.
・If the event period ends during a battle, you can get the Immortals Medal as usual but Rank Points are not reflected in the ranking.