Crazed Furbolg Blood

Crazed Furbolg Blood drops from various Redfang and Frostpaw furbolgs. They can be found fighting near Grizzlemaw, as well as several other places. Some amount of the blood may be acquired while completing the quests
 * Children of Ursoc
 * The Bear God's Offspring

Note that slaying a member of one tribe will grant you a buff, "Redfang Ally" or "Frostpaw Ally", making the player neutral to that tribe for 5 minutes.

As a quest objective

 * A Possible Link