Global Cataclysm: I’m Actually the Lord of All Beasts

[Apocalypse + mecha + giant beasts + special abilities + the protagonist isn’t human…] By the year 2200, humans had discovered many unknown creatures in the ocean, but they had shown no aggression toward people. Then, in March of that year, a being codenamed [Sea God: Demon Eater] appeared in the bay area of Beihai City, though it made no move. Six days later, it vanished without explanation. A swift search led humanity to discover a human infant named Wu Tian. From then on, the sea was no longer safe. Marine beasts that had once been harmless began attacking humans, the color of the land gradually turned gray, and many creatures, humans included, began to mutate. Three years later, humanity had been utterly defeated in its war against the land beasts, ushering in the Age of the Wasteland.