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From the Fire Emblem: Genealogy of the Holy War game, a new Grand Hero, Jamke: Prince of Verdane, is waiting in Special Maps.
Defeat the prince who turned his bow against his homeland to make him your ally!
Tap More for additional information about this event.
By clearing the map, you will gain the enemy Hero as your ally.
Reward for First Clear:
・ Normal: Grand Hero (2★)
・ Hard: Grand Hero (3★)
・ Lunatic: Grand Hero (4★)
・ Infernal: Grand Hero (4★), Hero Feathers x 2,000
As with other Hero Battles, if any of your allies fall in battle, it's game over, so proceed with caution. Grand Hero Battles also have a special rule: you cannot use a Light's Blessing or an Orb to continue a battle if you lose, so make your moves on the field very carefully!
Grand Hero Battle Notes:
• The number of difficulties available for a map may vary by each Grand Hero Battle.
• Although the same Grand Hero Battle may be released several times, rewards for each difficulty can be earned the first time the map is cleared.
• If the battle is started prior to the end of the event, you may stop playing and then later resume the battle using bookmark data until two days after the event ends.
• If the battle is started prior to the end of the event but not cleared until later than three days after the event ends, you will not get any of the rewards.
Learning Skills
• You can help Heroes learn skills by going to Allies, then Ally Growth, and then Learn Skills.
• Some skills can only be learned after raising a Hero's ★ rating.
About Jamke: Prince of Verdane
The prince of Verdane. He does not carry the
blood of a crusader in his veins. He turns his
bow against his homeland to try to stop the war.
Appears in Fire Emblem: Genealogy of the Holy
War.
Skills learnable at 5★:
Slaying Bow+
Mt: 12 Range: 2
Accelerates Special trigger (cooldown count-1).
Effective against flying foes.
Astra
Cooldown: 4
Boosts damage dealt by 150%.
Cannot use: 
Heavy Blade 3
If unit’s Atk > foe’s Atk, grants Special
cooldown charge +1 per unit's attack. (Only
highest value applied. Does not stack.)
Cannot use:
Cancel Affinity 3
Neutralizes weapon-triangle advantage granted by
unit's skills. If unit has weapon-triangle
disadvantage, reverses weapon-triangle advantage
granted by foe's skills.
Cannot use: 
"I find unscrupulous behavior abhorrent. I cannot abide those who abuse their authority."
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