Ice World Pleistocene Mutant Wars:

In the age of ice, many mutant life forms developed sentiency... Over different continents, these tribes lived, loved, fought for supremacy, and died. These animal mutants formed alliances with each other through their struggles, friendships, differences, and similarities... Cultures, tribal customs, religions, and kingdoms great and small evolved... This evolution caused upheaval and epic confrontations between old prehistoric enemies and new creatures never before seen.