FusionDex

Forretrum are clad in a metal shell with little to no openings. Because of this, their bodies are often at risk of overheating, so they regularly vent steam from the red ports around their necks.

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. It keeps itself inside its steel shell.