turns out one of the funding partners is Notch
Turns out the "big partner" helping fund Age of Wonders 3 isn't Epic Games but is Notch, creator of Minecraft, real name Markus Persson.
He's contributed to such a degree that Dutch developer Triumph Studios (Overlord) doesn't need a publisher for Age of Wonders 3, although distribution and co-publishing deals aren't ruled out.
Why is Notch doing this? Because he's a fan of the Age of Wonders series.