What if the Logicians had discovered a Warhound Titan somewhere in the Calyx Expanse back in the day, hauled it off to some dark engineerium to resurrect it with their daemonic machine spirits and heretical innovations, and then when the Meritech Wars started they began fielding the damn thing. The clans go on to kick untold amounts of Imperial ass with the crazy heretek Titan before House <Name Not Found> managed to wreck it, probably from space using lances. After inspecting them for potential profit and finding none, they then proceed to turn over the smoking remains to the Mechanicus, who are so stoked they're still sending you Emperorsmas cards because of it.
For all the grimdark, Warhammer 40k has always primarily been a satire. It has a sense of humor that's very black and Kafkaesqe, but it's also very pronounced.
That said, references to the real world like that are a bit over the line. Jokes that dispel the suspension of disbelief are discouraged.
This is the point at which the Imperials would kill you all, just to be sure. Why take a chance when bullets are so cheap? You're clearly involved in heresy of some kind.
It's better to depopulate an entire world of innocent, loyal citizens than to allow one heretic to escape the Emperor's Justice (TM).
You're not far off base, it's just that WH40k humor tends more towards the horrible than the light-hearted. See the sentence above where I talk about justice; that's actually a joke.
Understood.
Can we still use "bumbling our way to success" as part of the backstory? Like, we destroyed the heritek Titan from orbit because we were venting garbage to be burned up on re-entry (figuring that it's a warzone, and no one cares about enviormental regulations), and misplaced a decimal when calculating the atmospheric thickness.
So, instead of safely burning up, the cloud of trash we vented turned into a cloud of high velocity micrometeors that devastated the Meritech forces. Upon realizing this, we took their stuff and gave the Titan wreckage to the Mechanicus.
Is that ok for the backstory?
I mean, yeah, we accidentally outdo the Imperium, but their battle tactics veer between "SEND MOAR SPACE MURHINES AT IT! SHOOT SHOOT BOOM BOOM!" or "BLOW UP PLANET BIG BOOOM BIIIIG BOOOOOOM!".
I'm not sure "drop garbage on it from orbit" has ever crossed their mind.
(Although you mentioned Lances, so I'm guessing that they have some sort of "Rods from God" technology.)
Oh, can there be a Jace like NPC who shows up occasionally? I'm just seeing Jace in this setting dressed up in a suit of power armor made out of cardboard and spray painted blue and gold, so he can be a "Ultramarine, because I'm a future retired Ultramarine, because they're the best Space Marines!" (or would the Space Wolves be more Jace-like?) And of course, brandishing his customized "Emperor's Warriors" brand toy pistol.
I'm just seeing Jacanius as a running gag, where he shows up, suffers some horrible fate (getting dragged off to the warp by Space Homos), and inexplicably shows up later, completely unharmed.
Okay, I'll stop being stupid now.