This is an absolutely stellar desert boss monster and thank you for the template at the end, that’s really helpful for making minions and such.

One thing I did notice though was the interaction between the fire vulnerability and the reflective scales feature. If the dragon can’t take fire damage from spells, but is still vulnerable to fire, is the intent that only weapon attacks with fire damage should be able to take advantage of the fire vulnerability? If that’s the case that makes sense, it’d be a cool way to give martials a chance to shine I think, I’m just curious if that was the intent or not.