Boss Bounty
From Guild Wars Wiki
This is available for each of the group that has a title track in Eye of the North while affected by a blessing:
Occasionally known to be kept for two or more bosses, the bosses in succession you kill will still give you the reward of 300 reputation points.
Boss Bounty is a Blessing that has a chance to be granted after every 25 kills.

Image:Boss Bounty Norn.jpgImage:Boss Bounty Vanguard.jpg
Normal Mode Blessing. For 5 minutes, you earn +200 reputation for the next boss you kill.
Hard Mode Blessing. For 10 minutes, you earn +300 reputation for the next boss you kill.
[edit] Trivia
The Character in the Dwarven Boss Hunt Icon seems to be Dagnar Stonepate on his Ice Drake

