Republican military forces. The remaining forces gather and awaken the Ultrasaurus, a giant mobile fortress Zoid meant to be used as a last resort. The Ultrasaurus is fitted with the gravity cannon, an immense weapon nearly as large as the Ultrasaurus itself. Hiltz continues his campaign of destruction across the continent. The Ultrasaurus pursues, and Van, Irvine, and Thomas close in to pin down the Death Stinger for the gravity cannon. They successfully hit the Death Stinger with the gravity cannon's third and final shot, crushing it. Its Zoid core shuts down and the Zoid begins to turn into stone. However, Hiltz's organoid Ambient appears and fuses with the Death Stinger, resurrecting it. Van and friends make headway against the still-weakened Death Stinger, but Hiltz, the Death Stinger, and Fiona all suddenly dissolve into light. Fiona materializes before the Dark Kaiser, revealed to be Prozen merged with the Death Saurer's Zoid core. He manipulates Fiona to open the doors to the Ancient Zoidian city of Evopolis, where the Zoid Eve is located. Fiona regains her memories and explains that the Zoid Eve is the source of life for all Zoids. Zoids initially brought great prosperity, but some turned them into tools for war. The Death Saurer was created to end all wars, but instead began to destroy everything. The Zoidians could not bring themselves to destroy the Zoid Eve, which would end the life of all Zoids, so they sealed it away along with the Death Saurer's body. Hiltz and the Death Stinger re-materialize in front of Van, who is heading toward Fiona. Van faces Hiltz, aided by Ambient, without his own organoid Zeke. He astounds Hiltz by out-fighting the more powerful Zoid. Van and the Death Stinger arrive at Evopolis, and Prozen demands that the Death Stinger merge with him into the Death Saurer. However, the core instead absorbs him. Hiltz and the Death Stinger merge with Death Saurer core, bringing the monster back to life. The awakened Death Saurer is much more powerful than the incomplete clone that was previously defeated. The combined forces of the military, Van, Raven, Reese, and a fourth gravity cannon shell are unable to even harm it. The Death Saurer and Hiltz are finally stopped by firing the Blade Liger out of the gravity cannon like a bullet, piercing the Death Saurer's core, critically damaging it and killing Hiltz once and for all.