I mean... Obviously a fish with a freaking sword on its nose is a D&D monster. It goes without saying.
I think I first statted out a swordfish in my early teens. Its just something thats an obvious adversary or predator to deal with in an underwater adventure in warm temperate or tropical conditions.
I also have a couple of fossil species of swordfish statted out. Shall add those in good time.
Swordfish
by Cab Davidson
Stat Swordfish AC: 5 HD: 3 Movement (Swimming): 240’ (80’) Attacks: 1 sword Damage: 1d10 Number Appearing: 0 (1d3) Save As: F2 Morale: 9 Treasure Type: Nil Intelligence: 2 Alignment: Neutral XP Value: 35 A large game fish, typically up to 10’ long but occasionally reaching 15', with a long, sharp sword like horn on it nose. Usually passive but an active predator that may be dangerous if angered, it can puncture the hulls of small boats with its sword. If it can charge into combat it can inflict double damage. Swordfish hate sharks, and will often attack them with the aim of diving them off.