I just really like Crossbreeding, and I thought i'd try and make a nation sorta based around that, but in the meantime my fertile brain-fields have grown a crop of backstory.
Basically, a being of divine perfection was stranded in the lands of a crumbling empire. It was worshipped, but soon died. The inhabitants of said empire now strive to achieve such divine perfection by entering the Star Crater where the divine being landed. The crater is so full of magical residue and holy power that anyone entering will be mutated and transformed. Mostly the results are freaks and mutates, but occasionally a man may transcend into a partly-divine being.
All of that gives me ideas for recruitables, heroes and spells. Hooray for brain-fields!
EDIT:
Well, looking at that, you probably want more than backstory. So here's a very basic list of pros and cons, which probably will change at some point...
Pros:
> Extremely powerful leaders with many special abilities.
> National summoning spells which can summon whole armies.
> Almost no-one should reach old age.
> Great nature and blood mages.
Cons:
> Almost all units are chaff.
> Generally low morale.
> Extremely limited magic paths.
> National summons cost many slaves/gems.
EDIT2:
Okay, i'm going to start work on it now. I'm not much of a modmaker, and my artistic skills.. uh.. leave something to be desired. Which luckily shouldn't matter much, as I can just use existing sprites for many of the units.
Smoke me a kipper, i'll be back for breakfast!