Explaining how it works takes a long time, but I'll do my best to summarize it.
Erde's entirety is the core, that is the only thinking and feeling part of his body.
Erde's body is made up of earth, this is a protective layer that gives him a medium to interact with the outside world. He does not feel anything that happens to it. This is a puppet that bends to his will, I suppose a magical connection would be the explanation for it. It moves like a liquid or a solid depending on how he controls it. Otherwise it's just a puppet form that is not living.
Erde's entirety is the core, that is the only thinking and feeling part of his body.
Erde's body is made up of earth, this is a protective layer that gives him a medium to interact with the outside world. He does not feel anything that happens to it. This is a puppet that bends to his will, I suppose a magical connection would be the explanation for it. It moves like a liquid or a solid depending on how he controls it. Otherwise it's just a puppet form that is not living.