An ordinary boy's necklace becomes the target of an evil, world-destroying magical creature. It turns out the necklace has a deep secret which may be the key to saving the world.

In a world where magic is on the verge of chaos, four renowned knights: Spade, Heart, Diamond, and Clover, struggle to uphold peace, only to have their efforts shattered by the malevolent Herobrine. Fifteen years after the desperate sealing ritual that claims the lives of Spade and Heart, three siblings: Marvel, Samsul, and Peppey embark on a journey into the forbidden lands of Vermilion. Marvel's mystical green pendant awakens dark powers and attracts Herobrine's sinister attention. As they encounter unexpected allies and foes, Marvel uncovers secrets of his lineage and the legendary stones that shape their world. Caught in a whirlwind of deceit and power, the siblings must utilize their newfound abilities to thwart Herobrine's dark ambitions and rescue their world from impending doom.