In Battle for the Deep, four aquatic factions vie for control of the vast oceans: the Undersea Kingdom led by Coraline Oceanus, the Leviathans commanded by Scyphozoa Regina, the Protectors and their Turtle Mother, and the Denizens of the Deep, who are controlled by the necromancer Azazel Dreadborne.

However, after centuries of battle, it has become obvious that no one kingdom is powerful enough to bring peace to their world. The factions must choose an ally...