Bune infused with the power of nethicite. Hunted in the Pharos at Ridorana.
How to find
The player must have spoken to the "Huntmaster" in Phon Coast and defeated Thalassinon to start the Hunt Club quest. Avenger then has a 40% chance of appearing in the Station of Ascension area of the Pharos: Second Ascent. Alternately, one can kill off all the monsters in the area and then zone out to the Reach of the Damned area (64F). Upon reentering Station of Ascension (63F), Avenger should be at the bottom of the stairs.
Despite Avenger and Bune'sbestiary entries showing them wielding the Blood Brand, Dullahan's sword, they actually use another sword in-game.