how to deal with a dragons high attack roll

[mregecko]

Also, just going to point this out...

12d10 averages to 66 damage.

Even without the reflex for half, a level 14 character should be able to absorb that. (Assuming minimum of d4 HD & 14 CON, a wizard should have at least 74hp. More when you factor in empowered false life, hero's feast, CON boosting items, etc).

If your dragon wastes one of its rounds on an attack that is
A.) Probably not going to hit everyone [note: SPREAD OUT, but not out of delay death/buff range]
B.) Has a fairly easy save
C.) Won't kill anyone at 14th level...

Then your dragon isn't being played intelligently and you should be fine