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(Taken from Vampire profile sub forum)

"Voidmaster - These Vampires have lent so far into the darkness that it has almost claimed their very soul as well as their body. They have become the eyes and ears of a much higher power, and as such are protected by it. They can manipulate darkness and shadows to their own use as long as it remains connected to them, but lack the blood frenzied combat skills or psychic abilities of other vampires."

Keep in mind that these guidelines for what a Voidmaster is apply to the average Vampire, and that Veroen, Alexz, and Rogue are Elders. Elders dont have too many weaknesses officially, otherwise an Elder would be subject to easy extermination by new characters, and if an Elder is going to continue to be in a place of Leadership with the Coven, then its necessary that they are much stronger and harder to kill. That being said, when Elders are alone, they aren't as strong as when they are together.

And as far as what an Elder's weaknesses are, the biggest weakness I could think of is themselves. But dont worry, as an RPer, I enjoy plot twists and whatnot, and know not to God-mode my character past what he is capable of and know not to dismiss any well thought out attack towards his weakness, and so do Rogue and Gabby. The Void isn't necessarily the biggest of your problems, seeing as Rogue and Alexz are Elders of the other races of Vampires. Veroen is strong and quick, but relies heavily on his skill as a Voidmaster to boost his expertise in combat, while Rogue is more of a physically superior Elder, even to Veroen and Alexz, while Alexz's power as a psychic is unmatched by either V or Rogue.

Now to answer your question directly, the Void is exactly what its name suggests: the ultimate darkness, something with its own agenda, and something that is completely evil and unrelenting. Honestly the Void is something that is more on the side of Tainted powers, but is usable by Vampires. It consumes its users eventually, and the weakness of a Void Master is himself, and his lack of superior physical attributes that Rogues character has. Though V is an assassin who was once a deathdealer, without his control over the void he wouldnt stand a chance against Rogue if the two were to fight, or against Alexz.

The Void user draws on energy from the Void, and its nearly impossible to sever that connection once it has grown past a certain point of no return. But a Void user struggles with keeping in control and not destroying himself and those around him. You're gonna have to implement that into your strategy as the Founder.