[quote=@ClocktowerEchos]
[@Willy Vereb] 

The Black Tortoise was a near invincible tank that no one knows how the hell it could withstand things that'd level a fort. I originally made it as something famous like the 104th Airborne irl, something nice to put on propoganda. Although I am kinda tempted to make it the name of some elite tank group, I'm not really sure if I want to pursue an actual invincible tank since that seems a bit too OP for me and I already have the Chi-no-Sugoi SPG which is basically invincible from the front and top.

The wars part sound good to me, can we have it that the first one in the 1920's ended up with a slight victory for me and then the one in 1936 ended with me getting my ass handed to me on a shiny silver plate courtesy of the Yllendthyr Air Force?
[/quote]Well, it could've gone the other way around, I think.

In 1924 Yllenthyr introduced tanks they copied straight from Eisenkreis. 
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These combined with Yllendthyr's aircrafts allowed them to have an edge over you in the beginning.
Then the war came in 1935-36 where Yllendthyr was forced to acknowledge the need to up-arm their tanks because you already had medium tanks while I tried to hurt you with only 33mm autocannons.
Air power wise you also caught up in aspects so the idea of dive bombers supporting my rapid tank force often failed.

The only problem I have with this that then Yllendthyr would be aware of many of its tactical failings which I wish to portray.
Yllendthyr supports the Blitzkrieg strategy and focuses on light but fast vehicles and lots of motorized units in combat.
Or the above mentioned reliance on dive bombers.
So perhaps it'd be better if you pick a different nation to fight and force you to develop (or propagate the myth of the Black Tortoise).
Alternatively the Black Tortoise could be a WW1 styled tank which was ahead of its time and indeed did survive an 500lbs bomb (by it not being a direct hit).
Also I don't mind "super tanks" so long they are rare.
How about making the Black Tortoise from "depleted Sakuradite" which is dense, durable but also much heavier than steel while also being damn expensive?

BTW, do you sell Sakuradite as explosives?
I may use them for certain explosives. I figure they are stronger than RDX. If it has the same efficiency as in Code Geass, it may ridiculously so. Remember only a handful being enough to kill hundreds or even more.