I mean we do have the fel totem tribe i believe is there name. Besides i dont think the warlock classs needs lore to support it.
Since i think warlock is just any caster who wanted more power and starts messing with dark magic to obtain which every one of the races are subject to greed for power.
I believe the only race not suseptible to greed might be the naruu. Though even them can fall over as well i think.