Bardur

Bardur can be found deep inside Waterbirth Dungeon, fighting Dagannoth Fledglings. He will trade the player a cooked shark in exchange for a Fremennik blade, shield, or helm, any of which are obtainable as drops from Dagannoths. Players may attack Bardur but he seems to have a high defence level and heals himself by eating sharks.

In the Blood Runs Deep quest, Bardur appears outside Waterbirth Dungeon and tells the player that the other enterance to the dungeon is on the south side of the island. He also gives the player a free rope to use to descend into the hole.

Trivia

 * His name seems to be a play on the word barter, which means to exchange objects for others without the use of money.
 * It is also possible for players to have the fremennik name "Bardur"