Coming up with a concept isn't a problem (it's already done), but figuring out the characteristics, heroes, the overall look, and so on – that's where it gets tricky. You need to come up with ideas, understand the game, and most importantly, make sure the balance is right. And I wasn't suggesting combining them. I came up with a good idea with the Minoans. And yes, the idea of them ruling underground is interesting. P.S. Sorry for the slight off-topic.
Of course, I came up with something good. Nival should hire me! If the mages weren't desert dwellers, but lived like in Heroes 3, in the snow – that would be cool!
So you fall at his feet hes the one who betrays you
Its the servants devotion for the decay
Stand up
There are no flowers on your grave
There are no chains
There I keep chanting for the forgotten name © Amorphis