The deep sea is the best barrier, even for those with Third Order strength, resisting the pressure within the deep sea isn't an easy task, let alone the chaotic spiritual energy which will also greatly affect those who enter it, unless they were monsters born of the deep sea themselves.
Even a Fourth Grade entering, the several kilometers depth of the seafloor would also pose a huge hindrance, making it difficult to exert normal combat power.
Perhaps only a Fifth Order could truly explore the deep sea.
Su Han followed closely behind the Giant Shark Leader, having already delved about three thousand meters into the seabed, far from the coast, he had reached a position close to the center of the ocean.
Around him, there appeared more and more Fishmen, while huge Sea Beasts were also constantly swallowing spiritual energy in the seabed, preying on each other.
"The Sea Beasts and Fishmen that attack the land probably don't even account for one-tenth of those here."