Use Heroic Grails

"Heroic Grails are quite the mysterious things. You can use them to recruit Heroes from past Tempest Trials and Grand Hero Battles!"

- Feh, Feh Channel

In the Use Heroic Grails menu, items can be used to summon specific Heroes to the barracks.

Usage
100 Heroic Grails are initially needed to summon a Hero. Afterwards, the cost for summoning increases by 50 until it reaches 500, after which it remains at 500 for the rest of the available summons. Every Hero can be summoned up to a maximum of 20 times each.

200 Heroic Grails can be obtained from First Visit Bonus: Heroic Grails, by entering the Use Heroic Grails menu for the first time.