What can you guys tell me about Black Fire?
Depending on how much of a sense of humor you have about
Star Trek, it's either the worst thing ever or the best thing ever. It's a wildly over-the-top exercise in fanfictiony excess, but it's just so insanely epic a roller-coaster ride that your life will be poorer if you never experience it.
I agree that it's odd that the Pact isn't mentioned other than this, although there's no reason why a member nation can't have a solo outing - the Breen had one in the first Cold Equations book.
Heck, four of the first five
Typhon Pact tales were pretty much solo outings for their respective members. The idea behind the Pact was never to homogenize the six members into a uniform mass, but rather to provide a framework for stories fleshing out the individual member species, most of which were races that had gone undeveloped in the past. So it was always about the individual cultures at least as much as the gestalt.
I read Dyson Sphere, a sequel novel to the episode "Relics", and found it to be quite bizarre and pointless.
I did find the nonfiction essay at the end of
Dyson Sphere to be rather fascinating.
Also, there's a '70s-era book, World Without End by Joe Haldeman, that I never see referenced anywhere. It seemed like a ripoff of "For the World is Hollow..." and several other episodes. But I haven't seen it in easily 30 years and may be remembering wrong. Any opinions on this one?
Hardly. The generation-ship concept existed in science fiction long before
Star Trek used it, with notable examples being Robert A. Heinlein's 1941 story "Universe" and Brian Aldiss's 1958 novel
Non-Stop. Haldeman, being himself an experienced and Hugo-winning SF prose author at the time he wrote his Trek novels for Bantam, was probably far more influenced by Heinlein than by "Hollow." (David Gerrold certainly was when he wrote his own generation-ship novel for Bantam,
The Galactic Whirlpool.)
World Without End isn't as good as Haldeman's previous Trek novel
Planet of Judgment. But it has its moments, including an interesting early take on Klingon culture.