From publisher blurb:
Discover the dying power of eldritch surface magicks collecting along the ocean floor while exploring the mysteries of the ocean and the abundant life of the deep seas! Reality Deviant Publications presents Aquatic Hazards -sixteen underwater hazards born of dying magic, all designed to challenge and terrify your players! Whether found within the rivers, lakes, and oceans of the world, or buried in the forgotten pools of ancient crypts, these hazards will add spice to any campaign!
Each hazard is detailed with a complete description of its appearance, the nature of the hazard, and detailed information on the origin of the hazard. Discover the decomposing power of bone dust, be entrapped by the lure of coral song or experience the vast planar energies in dimensional clouds and planar darkness!