Nega Dimentia is Dimentia's all-powerful godlike form, which she became when she combined herself with the Star Rod, Jirachi, GKND H.Q., and all the negative energy from the Wisps. Nigel and Darkrai both became super and used their swords against the monster that served as the final boss of Operation: GALACSIA. It was surrounded by a large barrier that they had to destroy, while also avoiding incoming Magiblot ships. After the barrier was down, the gang laid a few more hits upon her before both Nigel and Darkrai sliced and stabbed her with their swords, sending her into the black hole, Zathura, and destroying Zathura in an explosion of light. As a result, Dimentia and the GKND H.Q. were destroyed.