Harden was a six-star Vandel who had an obsession with finding gold. He attacked Shantigo in order to find its gold treasure but was attacked by Beet. Upon the realization that there was no gold in Shantigo, Harden decided to leave Shantigo alone, but Beet kept fighting, as he didn't want Harden to harm the humans any more. Beet attempted to destroy Harden, but a mysterious partner of Harden's confirmed the fact that there was no gold in Shantigo. Harden and the partner retreated.