The Void Quark embedded itself in the iron ash core at the absolute center of the star itself, where it began to consume everything around it. And in the process, turned itself into a black hole.
The sudden shift in gravitational pull at the core caused all the layers above to collapse and spin further inward, ever closer to oblivion. As it did so, it spun faster and radiated extreme amounts of radiation. Waves of intense heat and energy swept out as the black hole core was fed more and more, and caused it to grow exponentially.
As a result, the star all around it turned a deep, dark orange and swelled larger and larger. Its equator began to bloat and stretch as the sheer energies of the black hole core spun it faster and faster. At the same time, it easily consumed the planets closest to it until it was to the point of bursting.