Mermen are monstrous fishmen known for menacing both seafaring adventurers and fishing villages alike. They have blue scales and mossy green fins on their heads and tails, along with the webs between their claws. Though just as sentient as humans are, mermen are ruthless savages who shred their sea-faring prey to bits with their razor sharp claws. They has a tendency to make their opponents more vulnerable by casting Sap and/or Kasap.
Hellish fish men with cruel claws and slimy scales who hang around in gangs waiting for ships to sail by so they can drag them to the bottom of the sea.
These half-fish sea-dwellers often sojourn to the surface to test their strength against anyone they encounter. They've made many unwelcome visits to various fishing villages.
Merman appears as a C-rank monster of the Nature family as part of the limited The Second Adventure of Dai event. It can be recruited from the Dermline Island stage of In Search of the Strongest Sword at any difficulty and it can participate in Dark Armour Spear Hyunckel's Battle Road as a party member.
A merman makes an appearance at the beginning of the story as one of the friendly monsters living in the waters off the coast of Dermline Island. It assists Dai when he needs water transportation.