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What about the third one?  My guess was history, because I thought the apt naming and contradiction lies in the fact that history can be painted in various perspectives.

Is the second answer supposed to be 'tooth'? Because that's the only answer that comes to mind, and yet it doesn't accept the answer.

I figured that was the case, considering what the second ending was. I was expecting a jumpscare in the third ending... but I suppose that it's fitting that there is nothing but the void.

Without Marth, Medeus and the 'interlopers' both have won. But I don't think the former will enjoy his reign much considering what happened after.

That begs the question though: Why is it Hardin whose death will return the world on its tracks? Is his fate truly linked the fate of the world itself? Or maybe Naga-ex-machina shifted this doomed timeline into a mere vision/dream for the dying and atoning Hardin of FE3/FE11?

Absolutely. The trick here is to play the long game. Corrupted Marth will eventually lose all uses of his Rapier, in which he'll swap to the ineffecitve Iron Sword. There's a reason why Nyna is there after all: To keep Hardin and Camus alive. If Hardin dies, you automatically get the canonical ending. 

However, I think that the third ending behind beating Marth is endless void, where you're forced to skip turn after turn, with Hardin all alone in it. If the developer of this game can confirm that this softlock map is already the third ending they were talking about, that would be nice.

Cleared this in 4h27m23s with minimal idle grinding. The trick here is to grind your undying skills, especially Shrink and Undying and Speed Strike, to help with getting higher levels. Lore is also a must for faster gains