They become beings of the Void not literal void lords themselves.
Wizards of the Coast trademarked "Warlords of Khanar" for an expansion with a story about a guy who goes back in time on a savage world revolving around warlike clans with a lot of orcs (when Magic usually doesn't use orcs) to change history to prioritize the race he preferred. Then Warlords of Draenor was announced a couple months later and Warlords of Khanar was renamed Khans of Tarkir.
Wow lol
I'm sure the average consumer wouldn't of noticed much to be honest.