I understand why Rogue was frustrated with this roleplay, and made it easy to leave. He had to hand everything to his enemies. Oh, that's not the weakness, I guess they're OP and invincible, aren't they, one would say. He would say there is a weakness, you just have to look for it, but everyone says OP, no one looks for it.

Here's the weakness for the Seeders, though if it shows up immediately, then I'll call it godmoding and follow everyone to their doorsteps and begin a mass raid, cause why not, they're an uncaring sociopathic species that care only for the basic needs: Eat, Sleep, and most of all, Reproduce. Reproduction is the driving force behind all life, except for maybe sentient life. If reproduction were not the driving force, then there would be no evolution, no changing worlds, no life at all, really.

So here it is:

Extremely fast, but not the speed of light, that's too fast and would just go through it, with something at least 1/10th of the size. A freighter should do. Mass must be extremely high as well. A freighter, large freighter, filled to the top with water, or even better, gold, would disintegrate anything within the blast spot. Explosives are not needed. It'd simply disintegrate, explode, combust, violent blooming. Smash together, bright light, explosion, small debris from the center, and nothing left.

Physics say it is so, and so it must be.

The Supremes will be much less obvious than that.