Hey, guys, I just got an e-mail response from the Sage about this. I sent him this after first reading this topic. His responses in bold.
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Dear Sage:
It is currently being debated on the ENWorld message boards why a dragon recieves good reflex save progression. Some are arguing that dragons, being enormous creatures, should have a poor Ref save progression, or at least some sort of penalty to Ref saves based on size (similar to the Size AC penalty).
Others say that dragons, being creatures of awesome might, should get the good saves. Reasons include a "sixth sense" to avoid danger, covering itself with its wings, and having its scales provide Cover to it. Also, it has been suggested that it was from a game mechanics point-of-view that this was done, making dragons the toughest creatures in the game.
Could you please clarify this, and if Dragons don't have good Ref saves, why was it not included in the MM errata.
Dragons recieve good Reflex saves because we wanted them to be the most challenging encounter possible.
However, there should be a penalty for size. Use the AC charts for the correct values. This applies to all creatures, not just dragons. Change all the saves listed in the MM to reflect this correction. It affects PC's as well (check the PH errata; it was updated yesterday).
I can't believe that R&D missed this one; I'll let them know immediately.
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Well, that should settle the debate.