Now before an arguement happens, YES, I know that we've just heard of the void lords, and have no intention of their powers. However, the cronicles book does give us major hints of their power, and why i think they make both the old gods and legion feel like a 1st evolution towards them
1. These beings are so powerful, that they can't manifest to the physical realm. However, the most powerful void lords are able to send guys out into the universe little by little. These things are called "Old Gods". I'd assume that every black hole that you see inside of the universe, are just portals to send the old gods through to corrupt little world souls for the taking.
2. When sargeras heard about the void lords plans to corrupt a world soul to destroy the entire universe, sargeras was pissed scared. Even if a so called dark titan soul was unstoppable, it was still puny towards these so called "Void Lords". And I assume that these void lords are not the same ones we've faced during the outland thing, I mean...they can't manifest inside of the universe, and technicley the twisting nether is part of the physical realm, it's just another plain of the phyisical realm.
3. During the illidan novel, the prime naaru talking to illidan said that the burning legion itself, and sargeras was no match towards another threat. And threat was the void. However, while the void lords might just only sound like voidish gods, they're still void itself. They are manifested versions of the void shards that were left to rot alone after the universe was created.
However, if we were to compare them tier wise. I wonder how powerful they may be. Sure, their manifested minions called old gods might be like twigs towards the pantheon, but they're dead, and the legion exists, and the void lords have the ability to see what the hell is going on from within the universe. So, if I were to give the void lords a tier, i'd say they're tier 2. And tier 2 is like universal level.
I'd say they're around a 2-A, or a 1D/1C. Do you agree with me? If You don't, tell me what tier you think they're at.