Bound Hero Battle Revival: Leif & Nanna started today in Fire Emblem Heroes. It features a pair of characters from Fire Emblem: Thracia 776. On top of that, there are quests that reward Orbs for defeating foes with Sharena: Princess of Askr and Fjorm: Princess of Ice. Fire Emblem Heroes will be hosting Bound Hero Battle Revival: Leif & Nanna...