The draenei (also known as draenei warlocks and eredar warlocks) are a race that have been studying the demons of the Burning Legion for millennia and are therefore, technically, demonologists.
Dark Practices of the Draenei
Draenei warlocks are the most volatile and insatiable of spellcasters. Though they often pledge themselves to the service of noble causes and are not innately evil, their desire to understand darker magics and exercise unwavering command over demonic forces breeds mistrust among even their closest allies. Draenei warlocks peer into the Void without hesitation, leveraging the chaos they glimpse within to devastating ends in battle. Their greatest abilities are fueled by the souls they’ve harvested from their victims and they exploit powerful shadow magic to manipulate and degrade the minds and bodies of their enemies. They employ fire magic, dropping hellish rain from the sky, to immolate the opposition. They summon and command indomitable demons from the Twisting Nether to do their bidding, or even to be sacrificed as the draenei warlock sees fit, empowering and protecting the dark caster from harm.
By their very nature, demons are leeches on the living universe—but the draenei demonologist has mastered harnessing the power of these malefic beings on the field of battle. Draenei warlocks harvest the souls of their defeated enemies; those specialized in the ways of demonology use this life essence to tap into the Void, pulling all manner of abomination from the chaos of the Twisting Nether. While such a practice is often considered by outsiders to be wicked and reckless, the demonologist maintains absolute control over the summoned creatures. These malignant entities are fully beholden to—and empowered by—the will of the draenei warlock, until banished to the realm from whence they came.