[Sombre]

I'm reluctant to add something like fly swarm summons because it isn't mentioned in WHFB and while I have taken some liberties to fit them in dom3, these are supposed to be Warhammer Skaven.

People have asked for the horned rat as a pretender choice a few times. Here are the issues:
1) I don't like doing pretenders. I can't even explain why, I just don't. I'm half tempted to delete the seerlord and I even hate adding vanilla pretender selections to the nation (though I will do so, under duress).
2) The verminlord graphic isn't even finished because I find big graphics really, really hard. See the Ogre Slavegiant and the skaven Screaming Bell and Doomwheel as examples. I tend to get halfway then get frustrated. Thus if I were to add the Horned Rat it would be very challenging for me to do him justice graphically. Perhaps he's an oversized verminlord, perhaps he's a size 6 giant rat with horns - either way I'm not really up to the artwork.
3) The gods in warhammer tend to be gods in the modern sense. They represent certain ideologies and are invoked and worshipped, rather than having a physical presence. Sigmar isn't a giant titan that leads armies around blasting **** with a thunder hammer. Khorne doesn't personally go decapitate people. Same deal with the horned rat, only moreso as he's very mysterious and has many aspects (for example pestilens worship him in his harbinger aspect). They're also proper GODS. Not pretenders that can be killed, or who need boosters to cast stuff. Now I could easily get around this. It could be a statue of Sigmar, an avatar of Khorne, an aspect of the Horned Rat. To an extent, this is what the seerlord is.