The Neo-Soviet marine biomods
Greentails, sirens, mermaids, merfolk, the creature you think of when you hear these names is a Tangaroa.
The Black Forest- actually a part of another forest, is said to be cursed by the presence of some horrific monster, which burns the very earth with its body!
No one has yet seen it and lived to tell, so be warned!(see NPC Aurelius Blackfoot for details)