Quote Originally Posted by TyGuy View Post
I just read the chromatic greatwyrm block and they have an aura that's 60' radius centered on them. That's fine for a 20×20, but how does that even work for a 300'×300' greatwyrm?
You could have it begin at the edge of the greatwyrm's space, not the center. Thus with a 300x300 foot greatwyrm, a 60 foot radius aura becomes a 210 foot radius aura (sort of, it wouldn't be a true circle since it's emanating from the edge of a square, more like a 420x420 foot square with rounded corners). I believe reach already originates from the edge of a creature's space; IIRC I found one listed monster who has a reach that is smaller than their size, so if reach was from the center of their space they wouldn't be able to reach anything.