Gained from Quests:
Balga's Dais BCNM 40 - Steamed Sprouts
Horlais Peak BCNM 40 - Tails of Woe
Sacrifical Chamber Level 60 BCNM
Sacrificial Chamber BCNM 60 - Amphibian Assault
Undying Promise (Fei'Yin BCNM 40)
Waughroon Shrine BCNM 40 - The Worm's Turn
Dropped off Mobs:
Orcish Zerker (Level: 50 - 58) (Davoi, Monastic Cavern, Zvahl Castle Keep, ...)