Mer

Introduced in the Blood-Dimmed Tides World of Darkness sourcebook: Merfolk (Tritons, mermaids, mermen, the ocean's nobles and seducers) and Murdhuacha (pronounced me-ROO-cha; nucks, merrow, sea monsters). These two Kiths both begin life as Nereids (Mer children, or the "larval" stage) yet attain maturity by merging with an Apsara, a sea creature ritually bonded with the Nereid to form roughly half of the changeling's new body (usually the body's lower half and the extremities). Nereids whose Apsarae are bony fishes, sharks, cetaceans or even oceanic reptiles evolve into merfolk; Nereids who bond with crustaceans, jellyfish, squids, octopuses, worms or other oceanic invertebrates become murdhuacha. The two Kiths are traditionally mortal enemies, but the rising tides of Banality and the human defilement of the oceans have forced merfolk and murduacha into an unsteady truce.