Merfolk== Merfolk have their gills near their necks which only work when they are in water. On land they can breathe with their lungs like humans do. However, their gills cannot breathe in air, like a normal fish cannot breathe in air through their gills.
Even though fishmen are part fish, they are still mammals and give birth to live young. Merfolk can interbreed with other races. Though the result is not always pretty.
Merfolk where originaly subjects of Neptune before he left the mortal world.