Why hook the Rainbow Cannon up to a warship, when we could hook it up to Heph's entire power grid? The alien god is probably gonna eat Heph anyway.
I don't know what we'll be fighting, or where. Warship is probably the easiest to have lying around on whatever place you are. Hmm... Maybe trying some alien power source could be more fun... Although I guess that if our target is stationary, I could always have someone paint the target with a portal so I could shoot through it when I've finished sucking Hephaestus dry. Then again, portals can turn unstable when faced with extreme circumstances. But the inter-universal portal machine seems to always work, just has some accuracy problems. If I could get lucky with that... Now that would be fun.
thereby demonstrating to the entirity of the Ancient Entity Pantheon that humanity is a Threat, at least to their real estate
"Damn human brats!" Cthulu said while waving his walking stick at them.
"Always horsing around, messing up my lawn, I swear, young races these days *grumble grumble*"
you're one of the supervets, right? You'll be fighting an inky blackness with a silver halo that came out of one of our probes from another universe, ate the testing room, and is growing at relativistic speeds in Heph's outer system, gobbling up testing rooms and planetoids, and making its way immediately toward the nearest planet.
it may not be the Eldritch God itself, since i sent that original testing room and probe back through the portal, but "the piece that's left" in this universe - so an offshoot, at least.
Oh, that reminds me: we should blacklist the null universe that we sent that probe through - Silver haired Inkboi probably infected that one pretty hard too.