Khaitan Prime was underground, although the surface above where he rested looked extremely disturbed, which would allow any nearby creatures to know that something absolutely massive was underground.
Suddenly Khaitan felt a human presence and Rose from underground. He looked around and noticed a group of survivors with an army of tamed dinosaurs and even a tamed Zilla. Khaitan wasn't that surprised when they immediately attacked him. He began fighting them, he used a claw to swat away most of the dinos, and effortlessly blocked a blast from Zilla, which didn't hurt him whatsoever, he proceeded to shoot a couple dinosaurs with his energy balls and then blasted Zilla with one of his energy blasts. Khaitan Prime let out a loud roar as he charged a powerful attack, absorbing energy from around him into his hand, staying in this state for about 5 minutes before punching the ground, causing a giant explosion that caused a massive crater, killed the survivors, their army, and any living beings that were close enough to get hit. After Khaitan confirmed everything trying to defeat him was dead he began wandering around the island, every once in a while he'd step on an innocent creature by accident, but he didn't care.