Voidwalkers are not physical manifestations of the Void. They are not nightmares incarnate. They are not malignant entities that serve the void lords, and they do not live only to transform the worlds they infest into places of despair and death.
Professions of the Cosmos
Warlocks are magical practitioners who seek to understand darker, fel-based magics, including destructive spells. These voracious spellcasters summon demonic minions to fight beside them. At first, they command only the service of imps, but as a warlock’s knowledge grows, seductive succubi, loyal voidwalkers, and horrific felhunters join the dark sorcerer’s ranks to wreak havoc on anyone who stands in their master’s way.