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Demonology is the study and practice of using and amplifying demonic powers and the ability to summon items or Demons, mostly using Soul Shards.
The craft of conjuration is the primary focus of the warlock, and in taking on the mantle of a demonologist the warlock sacrifices knowledge in other areas of arcane practice. (WoWRPG 62)
For the Warlock Demonology spec and talents, see Demonology.