Aule

Though he was born to a nest of plague dragons, Aulë always felt the call of stone more keenly than any of his siblings, and quickly he left his birth clan to hopefully find a place among those like him. His own powers, however, were found to make stone of anything living, petrifying them and preserving them only as lifeless treasures, and he began to think himself as bloodless as stone.

Their first Created child, and his main heir, Thorin, was carved from stone and silver, and given life by Yavanna's powers over nature.

By combining the children he carved out of gemstone with the magic wielded by his wife, they were able to bring forth another two Created children, Arken and Bilbo, who became the spouses of Thorin.

He had believed that this was the only way for him to have children, filled with Death and Lifelessness as (he believed) he was. It was to his great joy and shock that Yavanna was able to lay a nest with him.