Abyss Fortress

Mist surges from beneath the earth, mutant beasts run rampant, and everyone in the world desperately chases the towering spires built by the Human Federation. Lin Mo awakens a mysterious blood mark that can strengthen all things, and he defies the current to go downward, forging an impregnable abyss fortress deep within the rock layers. When the endless tide of mist engulfs the heavens and earth, and the lofty towers topple one by one, the buried abyss fortress is the only sanctuary that endures through the apocalypse. — Description from novelcodex.org