Adventurer's Dirge is a merit song for the Bard at level 75 in Final Fantasy XI. It is a tier two skill that can be initially purchased for 3 merit points, and then upgraded twice for 4 and then 5 points.
Adventurer's Dirge is a single target song. The effected player character will lose enmity at an increased rate than normal. This song is used to help the shed hate from one character who does not want the mobs attention or help said character to avoid gaining hate in the first place.