Kill 10 Bloodfang Stalkers.
It looks like a group of the ambushers stayed behind. Make them pay for their insolence! Kill all of the Bloodfang stalkers at Olsen's Farthing. For Sylvanas! For the Horde!
You will also receive:
- 2 70 (if completed at level 60)
- 250 reputation with Undercity