
Bjørn Røyrvik |
The easiest would be to add the pyroclastic template to a dragon you like (probably red or magma), but that isn't quite the same thing even if it could do the same job.
Other than that, look at the 3.5 stat block and see what bits don't exist in PF, then look at PF stat blocks and add things that don't exist in 3.5 - like getting rid of Grapple modifiers and adding CMB/CMD, adjusting skills for class skills, putting HD in line with PF dragons,
The difficulty really is minimal.