The Avatar of Freya at the Rainspeaker Rapids wants you to go to the Death's Hand Encampment to the northwest and slay 8 Cultist Infiltrators.
I am an embodiment of but one aspect of Freya, daughter of the titans. I am the Lifewarden -- I was left here to protect this land against the threat of the Scourge.
I never anticipated the Lich King would send willing living servants to do his work.
I could easily crush these cultists myself, but I am all that stands between the undead armies and the rest of the basin. Go, <name>. Deliver my wrath to these insolent trespassers.