How Do I Save the World with Only Defense Stats?

The Songster Corps in the south founded a nation for the demon race. In the north, the Shadow Monarch and the Ice Empress are caught up in a civil war. To the northwest, the Wolf Clan keeps provoking the empire's borders. And to the southwest, the patiently lurking Flower Demons are still unknown to humanity... Humanity has been squeezed into a corner of the continent, and the Xia Empire is the only human civilization within the known world...

Bai Yang says that in the dead of winter, with things as they are, the only warmth to be found comes from a beautiful girl's thighs in black stockings, or the magically enchanted soft armor he wears, whose defenses are the best in the world.