Warlocks are individuals who wield demonic fel magic to summon demons or empower themselves. Any and all Warlocks in Azeroth (or Draenor, etc.) can be found here.
“Alfred Halforth is a worgen warlock that heads the caster corp of the military unit The Blades...Alfred C. Halforth
“Wip Made from a Heartwood tree. The staff was presented to him and others. An arcane orb rests...Summoner Edmond
“Not much is known about the Voidheart. Only things known is that she rarely leaves Faewood, and...Emma Voidheart