B'moth
From Multiversal Omnipedia
B'moth, also known as Behemoth or Phemaut, was an ocean-god worshipped across the world, who could control animals and the weather. It used these abilities in its goal to return all humanity to its original, savage state. B'moth often manifests in water-based forms like luminous pools of water or dense fog.
B'moth has been associated with Cthulhu, with some believing they are one and the same.