Sahaugin

Sahuagin are a predatory, piscine race that ventures from the ocean’s black depths to hunt the creatures of the shallows and shore. Though they dwell in the deepest trenches of the ocean, sahuagin view the entire aquatic realm as their kingdom and the creatures in it as blood sport for their hunting parties. The self-styled rulers of sahuagin ocean domains are massive mutant males that grow second sets of arms. They are terrible foes in battle, and all sahuagin bow down before these powerful barons.
Sahuagin worship the shark god Sekolah. Only female sahuagin are deemed worthy of channeling the god’s power, and priestesses hold tremendous sway in sahuagin communities.
Sahuagin are driven into a frenzy by the smell of fresh blood. As worshipers of Sekolah, they also have a special kinship with sharks, which they train as attack animals. Even untrained sharks recognize sahuagin as allies and don’t prey on them.
The sahuagin might control the oceans if not for the presence of their mortal enemies, the aquatic elves. Wars between the two races have raged for centuries across the coasts and seas of the world, disrupting maritime trade and drawing other races into the bloody conflict.
So intense is sahuagin hatred for the aquatic elves that the sea devils have adapted to combat their ancient foes. A sahuagin born near enough to an aquatic elf community can enter the world as a malenti — a sahuagin that physically resembles an aquatic elf in every way. Sahuagin are prone to mutation, but whether this rare phenomenon is a result of the wars between the sahuagin and the aquatic elves — or whether it preceded or even began the conflict — none can say.
The sahuagin put the malenti to good use as spies and assassins in aquatic elf cities and the societies of other creatures that pose a threat to sahuagin. The mere shadow of the malenti threat incites paranoia and suspicion among aquatic elves, whose resilience is weakened as the prelude to an actual sahuagin invasion.