Nigon is the second underground race.

Ah, I told you. That's exactly the problem. Each Castle was made according to a template. And that's how it turned out... almost everywhere, it's the "classic scheme." Let's have some originality!
Enough with churning out peasants/archers/gremlins/griffins! Why? Each race should have its own originality!
You can't be mediocre all your life. You need something of your own, something special. So that a new race brings something new, instead of another "classic scheme," just with redrawn units. Maybe that's why I play as the Inferno and Dungeon factions? Because it's hard to find Castles more original than these in the fifth game?
Ah... and again, I'll say something about the second game. It was my favorite part... everything is different there. Each race has its own unique feature. Not like here, where it's just a main ability... but all the units were conceptually unique, in relation to the style of their respective Castle... and then, in the third game, it all went downhill... everyone has 2 archers, everyone has two flying units, everyone has 2 identical heroes...
As our Xel said, wasn't it? Pop culture? It's the epitome of it...
We don't need classic schemes. It's just not worth it... enough of them...