Earth and Ellie are a crucial ally team introduced during the Faudo Arc. Their ability is swords. Also, they have a natural ability which is the sword Arth used can absorb other mamodo energy when they get hit or touched. Earth is a mamodo who appears like a living armor and descended from a long line of peacekeepers. He hopes that when he becomes the Mamodo King, he can write up laws that will bring about peace and stability.

Spoiler

Earth is shown to be extremely soft when concerning his partner, demonstrated when he starts crying after Ellie's curse was lifted, much to Ellie's embarrassment.

(Source: Gash Bell Wiki)