Instead, Gem lives with Lethalnium

Similar to William, Matti, Mickey and Frida

William has Lethalnium in his arms, completly corrupting them.

He can turn his arms into whatever he wants

His Eye socket is also dripping with it.

Mickey's Body is full of it meaning he can change his shape at any time.

Frida has Lethalnium in her legs, just to basically mantain mobility (Basically Frida got Crippled by Arthur before she gained her pyrokinetic powers)

You could barely see it in the old design, so the redesign shows it more.

Matti is basically the Jesus of Matticraft's World

With The Mask, He's Basically God

But Without It...

He's Mortal, Still mantains some of his powers, but can die like any human being.

Supposingly Xenocraft should also be able to produce such substance, but because he has a Condition that doesn't allow him to do such, he isn't able to produce Lethalnium (The X in his Stomach is the cause of it, the X isn't able to heal, so Xeno looses blood, but doesn't die from it, also no, it doesn't show his insides, it's not that deep.)