I do not have an exact size reading. I would expect it to be somewhat smaller than a hundred kilometres diameter.

As for its capabilities, it is best considered as a close quarters attack against the planet itself. If it hits surface, it will not only destroy an immense area, but poison air currents, water, and the very molten blood of your planet.

The problem is that even if we destroy it to stellar dust, as long as its dominating consciousness remains, it will continue towards this planet driven by sheer hate.