I initially posted this in the ancients sub-forum, but give my main opponent has decided to lean medieval/dark ages...this thread will make more sense in the fantasy sub-section and won't cause anybody heart attacks of the mis-use of respectable historical miniatures.
Concept: just challenging myself to make some fun rank-n-flank rules. That's it. Not a commercial prospect, just wanted to justify buying some Victrix and having some cool rank-n-flank lookin' armies. I've always enjoyed the aesthetic of stuff like Warhammer Fantasy back in the day, but despised the game rules, etc. I've watched some Hail Caesar battle reports and a few other historical ancients games, and they just didn't intrigue me enough.
So...armed with one buddy who expressed interest, we started collecting and building little armies in secret, on the off chance I ever got around to actually putting something together.
Then the notes started. I think of all the wargaming "aspects" designing games is definitely the one that occupies most of my time. So all games start as notes:

Notes eventually become notebooks full of notes...(in the case of my dungeon crawl...it's been a 20+ year project!).
Then I assembled an army, just...ya know, in case the notes became a game. Can't playtest notes if you don't have models, right? Seems like solid justification to me. The first decisions I made was simple; units would be X numbers of bases. I hate movement trays and casualy removal (I just think its' ugly), and small bases would make units almost as easy to move. So I opted for 40mm squares and circles for infantry (circles for skirmishers who "cannot" go into Close Order), and 50mm squares and circles for cavalry (and even those are a little small for the Victrix cavalry!)
Light Infantry Unit (units consist of between 1 and 10 bases)
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Light Infantry Unit (units would also be more..."Warhammer" scaled than reality. In theory the game is scale-agnostic so a base could also be 600 miniatures in 2mm I suppose...)
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'Berserker' Light Infantry Unit (I chose to use Dacians from Victrix as my base, as I like the look of them. Being an Imagi-Nations setting, these will be...whatever fake nation or empire I decide to use them as!)
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Light Chariots (Gallic chariots convetred with some Dacian figures)
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Light Missile Infantry Skirmishers (Skirmishers move faster, cannot fight in Close Order, and provide additional bonuses to an army)

The mini-army before I added cavalry:

At this point, the army is "big enough" for simple play-testing. We actually ran one play test game using my scribbled notes, and it was fun enough to pursue.
I also painted up some heavy cavalry (Gallic cavalry, again converted with Dacian heads, and some Dacian weapons, etc.)
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Within 24 hours of the play-test I'd designed and ordered tokens. The general idea being that units will draw combat tokens as they suffer casualties. Tokens will be blind or revealed, and enemy players won't know what some of your tokens are. Units will have a large variety of impacts from combat, a few good ones, and mostly bad ones.
The tokens will be both 'combat tokens' (each player has a bag of 80 tokens they'll draw blindly when suffering combat results), and a bunch of tokens for simply identifying battlefield conditions and unit conditions (inspiration, wounds, formations, deployment zones, etc.)

Then I got it in my head to design a 16"x10" neoprene mat for keeping score, and monitoring off-table assets (called, simply, Agents). So I whipped that up, though I have yet to order a test copy...

The idea being a kind of tug-of-war scoring idea. If you push the scoring token to your opponents Skull, you score a "major victory" immediately, if the game ends while the score token it on your opponents icon or higher, you win a "minor victory". An army will gain victory points for securing objectives, destroying or breaking enemy units, killing the enemy general, etc.
I will post more as this nonsense develops. It is likely not a commercial product, but I still want to produce it to the nicest state possible, and have yet another playable, fun game. It adds some variety to what we locally play, as well.
Oh..and...I'm not saying I already ordered some custom dice...but I ordered some custom dice. The logo simply came from what I decided to paint on my guys shields - something simple and something I could replicate. Why not a creepy bird? Then I whipped up the icon and threw it over to Chessex to get some dice (partially as a birthday gift for my buddy who's be playing with me).

So I had the skeleton of a game...had a cool little logo...had some nice dice. What would I call this project? I was thinking on the subject as I was painting and watching Henry the V. I got up from the table and as I turned off the movie, the last line was one I'd always appreciated:
“…and at his heels, leashed in like hounds, should Famine, Sword and Fire crouch for employment.”Now, admittedly this is aimed at ancient warfare a bit more than medieval...but the line was too good not to use. Boom. Done. Name acquired.