Forsaken hunters automatically know how to tame undead creatures. Hunters of other races must learn the skill from a Simple Tome of Bone-Binding which is a rare drop from miscellaneous Elite NPCs throughout Maldraxxus and its associated dungeons: Plaguefall and the Theater of Pain.
Located in Jin Yang Road, Vale of Eternal Blossoms. Only present during Mogu Assaults. Found near Tu'shen Burial Ground, at the same place Cracklefang spawns in the earlier (non-Assaults) phase.