You did so well with the lieutenants and underlings that I'd like you to do one last thing for me.
Serena Bloodfeather is the sister of a harpy named Bloodfeather who was slain by Rexxar quite a while ago. Apparently, these attacks on the Horde caravans are revenge for her sister's death.
I need you to slit her throat and bring me back her head. I want to place it on the next caravan we send out... Give those harpies something to think about.
HA! Well done, <name>! Very well done... I wasn't sure you were up to the task, but you've proved yourself quite the cut-throat. Thank you again for helping us suppress the Harpy epidemic. Here is your reward, use it well.