MikeeMiracle said:
Is this something we think we could conceivably use one day? Seems like we would need to create the black hole just before we send it which seems outside our reach.
Depends on the day! If it's tomorrow, thankfully not, but a day tens of thousands of years from now, even with fits and starts in our understanding of physics and applied engineering, then it seems possible.
By then, we might be throwing dark energy grenades at each other, which unravel the local spacetime topology and rip your opponents apart before petering out as they run out of puff.
Or, we might unleash causality clusterf**ks, which randomise entropy at various scales within a set period of time, obliterating anyone, thing, or alien entity unfortunate enough to encounter them.
Or, you might ensnare your enemies in big bang bomblets, little bubbles stretched from the multiverse that entrap your enemies before their inherent energy snaps them back, pinching whoever is encased in them off from our reality, never to be seen again.
The sky is the limit in sci-fi, and if your constraint is "conceivably" and "one day" you need to dictate what those parameters are
