QUOTE (HappyDaze @ Jun 19 2009, 03:53 PM)

I'm saying that I think your stats are seriously over the top. Force 24 with 24 hits is outrageous - it suggests a dice pool of 72(!) - and is not IMO reasonable within the scale of SR4 for even an IE or GD.
Using Edge re-roll for the permanent spell changes that to 43 dice pool actually and you
would use Edge for this. You'd also probably wait until you had a batter than average result before you used or Edge re-roll and Quickened the result. Initially, Even so, I agreed with you that it was a pretty ridiculous number and started writing a post with the maths to illustrate why. However, in doing so, I found that a Force 24 Quickened spell wasn't as unlikely as I thought.
A Great Dragon with Sorcery 12 and Magic 12 only has a dice pool of 24. How is Ghostwalker getting up to the 43 dice region? I know it is commonly thought that the stats in the book are for average great dragons and some of the named NPC ones have better stats. But I don't think there's anything like an "average" great dragon. They're all major players and dragons like Ghostwalker shouldn't be significantly better than the main book stats. But even if you're of the opinion that he is above these, is he 20 dice above these? Add in a Force 8 focus to that "standard" great dragon though, and you're hitting 32 dice already. Ghostwalker still needs to rustle up another 11 dice pool. But there's an easy route to that with a Force 11 spirit using Aid Sorcery. Okay, binding a Force 11 spirit is a risk in itself and costly, but a Great Dragon can pull it off so we're taking it as a given for now. That brings us to our 43 dice pool.
Now the more dice you have in your pool, the more your results tend toward the average. At 43 dice, it's not likely that you're going to need many attempts. The drain for Armour is (F/2)+3. At Force 24, that's 15P Drain. Okay, a Great Dragon with 13 in each drain stat can on average stage that down to a mere (!) 6P. So although the dragon will want to plan a nice secure location for these attempts and keep it secret when he's going to be at its weakest, it's not unreasonable.
So there you go - a Great Dragon with a Force 24 Armour spell is actually reasonable if you assume the following: Edge use for re-roll, Force 8 spellcasting focus, Aid Sorcery from Force 11 spirit, willingness to take 6P damage.
I've also ignored the possibility of magically augmented attributes for the drain. And quite honestly, I find some Quickened Increase Attribute spells scarier than Armour because Great Dragons have frightening augmented maximums. 19 Logic and Charisma, anybody?