I love these two models so I plan to add them to my collection (when I get round to it).
Although I think of myself as a modeller first, it is always nice to get minis on the table after putting in the time and effort to paint them. I don't play WHFB, but I think these models easily fit the fluff as large beasts captured for the arena (I am planning to make the dragon without its rider). So the question is, what rules do I use for them? Here are my ideas so far...CWE allies
The dragon counts as a Wraithknight. It would be fairly mobile, but unable to fly properly (perhaps its wings were clipped). Whichever weapons I costed for could be the effect of its breath (sadly no templates). If I used the Iyanden rules, it could even by my HQ (I think - don't own the book yet), so I wouldn't have to take a random Farseer to explain away. I can't see anything on the list which could obviously be the Kharibdyss though. Perhaps my opponents would let me use it is as 5 wraithguard (troops in Iyanden list?) - ie. Wraithguard stats with 5 wounds and 5 weapons (decreasing as it gets injured) - I'm thinking d-scythes to represent some sort of noxious breath.
The big advantage of this setup is the fact that the beasts would be battle brothers.Chaos Space Marine allies
The dragon is obviously a Heldrake with Baleflamer. Sure, it has to use vehicle rules, but it now flies, vector strikes and breathes fire - I can't think of anything else in 40k with rules closer to a dragon. The Kharybdiss counts as a maulerfiend (or perhaps a Defiler with cc weapons?). The use of vehicle rules isn't a real problem as penetrating hits etc are just vital organs. Exploding is a bit unusual, but there are plenty of weird beasts in the galaxy.
Problem is they would be desperate allies. This could be explained for the beasts by just saying that they are really vicious, and not tamed, so they have to be watched. Thing is, I would also have to take a CSM HQ and troop choice which would have the same issue, and need explaining.Chaos Daemon allies
The dragon could be a winged daemon prince, making it a flying monstrous creature (and what else would a 40k dragon be?). The Kharybdiss could be some other type of greater daemon. The problem is, they would now be subject to the Warp Storm rules, as would the rest of my army. And I would have the same problems of desperate allies and requiring an additional troop choice.Tyrannid allies
Clearly the first hurdle is that no-one can take tyrannid allies, so I would need opponent agreement. The dragon could be a Flyrant, achieving my aim of using him as a Flying Monstrous Creature again. I don't know what the Kharibdyss would be - perhaps a Carnifex. If I did this, I would need some troops once again, but on the beast theme, they could just be captured Tyrannid creatures used in the arena or in battle. If the troops were termagants, I could even count the Kharybdiss as a (funny looking) tervigon.
So what do peole think? Do any of the ideas have mileage? Does anyone have any better ways I could use these models with my Dark Eldar?