Well, I was thinking more along the lines of a more direct kind of psychological warfare. That's more of a mundane sense where they use other means to induce terror in their enemies. I mean large-scale, psychic psychological warfare. A very literal take on it.
For example, not only could they use direct tactics like mass mind control or brainwashing, they could also go directly to breaking the wills of others, no middle-man (or, in this case, middle-reptile). There's a lot of unique things that the Void has to offer, but just resurrecting dinosaurs isn't really that big of a deal. It's a thing that anyone else could have done for the psychological impact. Any Death Knight could do that with minimal effort.
What the Void Elves could do, if their potential were recognized, could be truly horrifying and alien. That's what the appeal of Lovecraftian magic is, after all.