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I really like the new true dragons introduced in Skeletons of Scarwall, the Umbral Dragons, but compared to the other 10 OGC true dragons, their ACs are all 2 points too high. The natural armor bonuses for all true dragons thus far are equal to their total HD minus 1, and the Umbrals have natural AC = their total HD plus 1. Is this a deliberate design change, a simple math goof, or what?

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I really like the new true dragons introduced in Skeletons of Scarwall, the Umbral Dragons, but compared to the other 10 OGC true dragons, their ACs are all 2 points too high. The natural armor bonuses for all true dragons thus far are equal to their total HD minus 1, and the Umbrals have natural AC = their total HD plus 1. Is this a deliberate design change, a simple math goof, or what?
The fact that the OGC true dragons have AC scores equal to their HD-1 may be a design element... but it could just as easily be an artifact of building so many dragon tables all at once that they just ended up that way on accident.
In any event, the umbral dragon is neither a chromatic nor a metallic dragon, so if there's some differences between them and the others, that's okay with me.