... and light.
The same light that's used for military-grade lasers.
And then comes the fact that part of the hull has just been converted into pure energy.
And those effects won't be the only ones if it was in an atmosphere, where it gets a bit more complicated as some of the energy is released in the form of really impressive shockwaves.
For all it's cartoonish themes, the antimatter bombs in Spore are actually kinda faithful to reality.