Within the salty waters of the earth, a powerful breed was on its rise to the top. Emperor undead beings were fighting amongst themselves, aiming to eat each other for the goal to grow stronger. Upon all those emperors, one remained to take its place as the king of the sea. Equal to a god, as the very creature could be indeed deemed as one. The creature belonged to the best evolution line and was even worshiped by many people.
Crabs...
Although they don't look like much, if given time, they could grow beyond the limits, which no other organism on earth have the potential to achieve. With the addition of the strange magical elements that mutated the death crabs to become alive and better than before, it was certain that they would become the apex predators.