Sahuagin: These green- or gray-skinned tribal monsters have created many societies under the waves. They are savage, powerful creatures, with a bipedal stance, though they retain many features from sharks. These are primarily a variety of fins on the back of their humanlike limbs, and an incredibly powerful jaw, though Sahuagin also possess fierce, sharp claws. They can swim as fast as their shark cousins with ease, commune with them, and breathe either air or water. Sahuagin tribes raid other communities with disturbing frequency, though the creatures show no sign of being 'inherently' evil so much as merely savage-one can attempt to make deals with them. Sahuagin think in a slightly different way then humans, though they ae intelligent enough. Their brute strength is incredible, as is their stamina, but they lack the necessary concentration to become good mages. Sahuagin reproduce as fishes do, which is good for the suvival of their race, seeing as many sahuagin are fond of flesh-including their own race's. They are the sworn enemies of the naga, who battle them for similar dwelling areas.
Naga: The naga are a race of serpent-men who dwell beneath the seas, though they still retain most humanlike features above the waist. They are a powerful, organized race who acts for reasons of their own-humans do not understand the naga's devotion to the group as a whole as opposed to personal growth and development. A juvenile naga is in most manners indistinguishable from a common snake, save for the addition of two clawed limbs. When they reach what in humans would be puberty, they enter a cocoon, and a year later emerge as teenaged-upper bodied humanoids, with the lower body of a powerful snake. During this stage of their life, they can become either good magi or good fighters, and reproduce as mammals do-naga-human halfbreeds are rare but not unknown. Some hundred years later, the naga undergoes another transformation and becomes a form mor suitable to their chosen path. This happens again a hundred years later. At this point they live for another hundred years and then perish, at which point their life experiences are added to another peculiarity of the naga, a sort of communal memory which is shared betwen the tribe. This might explain the naga's fanatical loyalty to their individual tribes- nagas without a tribe usually commit suicide. Naga can breathe underwater, and swim quite quickly. They are the blood enemies of the sahuagin.
How are these?