Kroos was a machine titan, created by the Tree of Knowledge, whom held Oscuro, the heart of darkness till his death.
Story[]
Kroos was created by an unknown blade, who sought to destroy mankind by using the Tree of Knowledge. After its creation, it wrecked havoc on the cities of Earth by was stopped by unknown hero. Although it was defeated, its was beating and was too dangerous to be allowed to be used again so it was sealed away.