The basic Prometheus is a capital tanker with 10k hull and 1.2k armor.
This was a joke before .97, but now you can slap some extra armor + hull on it for a super cheap 10dp destroyer anchor.
If you use 3-4 prometheus tankers and fill the rest of your fleet with destroyers with escort package, you can make short work on anything in the game, i know it sounds hilarious, but i tried it vs. Remnants and it works wonders, try this fleet:
3-4x prometheus (+armor, hull, itu, and whatever kinetics you can slap on it)
3-4x monitor (to put in front of radiants or other heavy hitters gunning for prometheus)
?x Sunders (HILs and some spare Tach lances)
?x Enforcer (4x HVD and dual flak for pd)
Destroyers get ITU and escort package
The amount of Sunders and Enforcers depends on weather you took Support doctrine or Direlic Operations.
You might think, that HVDs are poor dps, but when you can focus 40 of them over long range, it's more than enough.
This setup surprisingly melts anything, has enough range to match capitals and destroyers with escort package are WAY more manuverable than said capitals and to top it all off, you have enough pd to delete any fighters/missiles in your way. It's so much fun!
Update:
I am not saying that it's an optimal build, just pointing a fact, that this supposedly pure civilian tanker that i managed to unironicaly use in Remnant fights and win.
Prometheus is not there to provide firepower, other than plink shields with railguns, provide escort package bonus to destroyers and not die.