A void is an absence, an emptyness, a lack. Nature abhors a void (vacuum) - entropy and other laws of physics ensure that heat, matter, and all forms of energy rush in to fill a void (vacuum). A void attacks pulls / sucks / drains in ways that are supernatural extremes of those natural phenomena. Matter, all forms of energy including light and the Light ate violently pulled into a void vacuum so intense it can never be filled or satiated. Surviving a nova bomb might mean parts of you are simply gone, lost and obliterated as completely as matter fallen into a black hole. Surrounding flesh and armor would be twisted and pulled like the "spaghettification" effect approaching an event horizon has (only on too small a scale to be visible as such), particles bordering those drawn into the weaponized void would lose heat and Light and all other known forms of energy in degrees proportional to the intensity of the weapon (how powerful the void is, like nova bomb > axion bolt) and likely in inverse square proportion to the distance from the epicenter or even horizon? How would it feel? Like being pulled and sucked at by an inexorable and insatiable force, like slidding down a hill and struggling to climb up it while simultaneously freezing from the utter lack of kinetic energy and warmth and also losing your very Light, like your own soul wanted to full an empty bucket as water finds its level, but the bottom of the bucket can't be reached even as every ounce of your Light and your very soul are drawn into it. Or maybe its just like "ouch, Fing space magic" ;P