FusionDex

When Magrem attacks, it lets out a blast of lava before freezing it over with an ultracold Ice Beam to encase the target in hard obsidian. However, after the attack, its magma body destabilizes, so it also cools it into obsidian to keep it intact.

It generates a powerful, freezing energy inside itself, but its body became frozen when the energy leaked out. The shell on its back is made of hardened magma.