Krune had already gone slightly insane while he was adrift on the ocean. After all, a mortal's mind was susceptible to environmental conditions. Though, after he arrived at the Primary Landmass, the sense of land underneath his feet healed his mental state a little.
Nevertheless, at the end of the day, he was alone, mingling among corpses and monsters for his living. Growing stronger had become his only goal, his only drive. If his stay in the Primary Landmass didn't have any deadline, Krune's approach to the situation would have been way different.
Over time, he would have lost the very notion of getting stronger. After all, over time, he would have completely gotten accustomed to the place. Considering his superior intelligence, there was no chance he would ever fall prey to the Monster Geckos.
