With its hoard well protected deep within the lair, a red dragon spends as much of its time outside the mountain as in it. For a red dragon, the great heights of the world are the throne from which it can look out to survey all it controls—and the wider world it seeks to control...
Considering that CR tells you how great a threat the monster is, (MM 9) we need to determine if the stats gained by the Young Red Shadow Dragon make it more formidable than the standard Young Red Dragon. Once we determine this we can know where the error is in ...