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Kings with elemental powers fight against mythical creatures, monsters born of fear, to protect humanity—but only on the condition that it obeys them. The Fire Hearts, the alliance of Alexandria’s most fearsome kings, faced the Sackman, a mythical creature that feeds on the fear of children. Since then, Kio, Akai, Benckey, Haylen, Bel Bel, and Mako have overcome numerous challenges, met other kings, and forged friendships with some while becoming enemies of others. Now, they enter a new phase.