
EDIT;
I feel I should add abit more detail. He's an assassin boss, spawns in Mourning Veil Falls just outside the entance to Amatz Basin. There is a spawn of warden and a double spawn of Kirin and thier friends. Blurred Vision makes it hard, and the riposte build is unable to keep up with the damage. This is one of the places where the boss actually spawns twice, but you cannot lure him from his group.
His Daggers are 15 enchanted, 1:1 zeal and +30hp