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Necrotrum lives in wastelands, far from human settlements. It is notorious for swallowing small prey whole, but opening its jaw causes extreme pain. Because of this, it often relies on brute force with its claws in battle.

Thanks to its gargantuan jaws, which could shred thick metal plates as if they were paper, it was invincible in the ancient world it once inhabited. Light is apparently the source of its energy.