Singularity

This can generate a singularity, sacrificing the vessel itself. It then continues to grow, feeding off matter. Any vessels, friend and foe, that are too close to the singularity collapse into singularities as well, causing a growing chain of singularities that can also convert nearby vessels into singularities. Larger vessels result in larger singularities with greater range. (The singularities themselves have a repulsive event horizon, however, so not all the singularities come together.) Meanwhile, all the singularities gradually suck all vessels in the region toward them.