Mutant Crawl Classics - Crash of the Titans

The seekers are tasked with exploring the towering remnants of an Ancient city to recover a powerful artifact. To do so, they'll need to somehow avoid two skyscraper-sized leviathans battling for dominance over the ruined city. Can the party avoid being crushed by the mutant monstrosities or will they be trodden underfoot by the uncaring colossi?