These mobs are awful. Has a nasty fire dd, that they seem to cast rather quickly..faster than any player caster Ive seen, and dd does 230+ damage.
Darn thing got me before I could even hit sprint command. So if the Great brown drake steer clear of the area, because you might sneak past him, but the young ones are always nearby and they have a pretty good agro range. Unless of course your out searching for them.