Seriously, if anyone knows the reason behind this, let me know. Maybe it can help me understand the Vok a little more for the RPG. ...Maybe.
The Vok has never been explained in the cartoon world, and i can remember anything in depth about them in the comics either.
In FanFiction pieces, there where some interesting idea's being tossed around, like the Vok actually being the end result of the Swarm from the Generation 2 comics.
G2 Optimus Prime sacrificed himself, and the matrix to purify the swarm, and make it a peaceful entity.
The origin of the swarm was revealed in the Generation 2 comic series. When the Transformers were first created by the god of light, Primus, they originally had the ability to undergo binary division, to split into two separate organisms. After the Cybertronian population reached a certain size, a command implanted by Primus caused them to lose the ability to reproduce and to forget that they had ever been able to.
At the end of the Great War, after Optimus Prime and Megatron had left Cybertron for Earth, a group of Decepticons also abandoned their home world for deep space. They went about conquering other planets and terraforming them into "little Cybertrons." At some point these "Generation 2"(G2) Decepticons rediscovered the process of binary reproduction and used it as a tool to expand their armies.
Each split produced a small flying mass of Cybertronian genetic material that was not unlike cancer. In low levels, the flying cancer dissipated on its own. Unfortunately, the use of the binary reproduction was far more regular than Primus had originally ordained. The cancerous by-product formed into a massive cloud, and eventually gained some appearance of an overall sentience, despite no true central intelligence. At this point, the mass of robotic organisms descended on various worlds, consuming all metallic and organic materials, leaving only dead husks behind.
The Swarm, after attacking and devouring several Gen 2 Decepticon groups, absorbed their last orders - to head to Earth. Jhiaxus's command to attack Earth undid the last chance of stopping the Swarm peacefully, which then proceeded to attack all combatants, whether G2 Decepticon or G1 Transformers, devouring Jhiaxus himself. Optimus Prime realised the only way to stop it was to purify it with the power of the Matrix and the peaceful intentions stored within. Prime willingly offered himself to it, and his desire for peace, along with the power of the Matrix, purified the Swarm of its aggressive intentions, giving it a purpose. The Swarm is last seen traveling off into space, having rebuilt Optimus Prime as a parting gift.
So i think the Vok could be the end result.
And after scanning Primal, they saw a lot of similarities between Optimus Prime and Optimus Primal, and so took a positive stance towards him.
That would explain their power, and their drive to change the universe's destiny by traveling into the past, to start by working on Earth's development.