mostly classic right now some retail

how do i unlock void elves in retail?

im lvl 100 atm

You're going to need to do the legion xpac storyline

I'm not sure if you have to do all the quests. I think when you reach 110 you just unlock the Argus quest. but then you have to grind the rep.

Argus happened at the end of legion

Void Elf Allied Race