Hi. Not sure if its suitable but, off the top of my head, there was a thing by Frog God Games (I think) called 'Chucks Dragons' which had various high level dragons of many colours and their lairs. Might be of help?
This might be a resource:
http://thecampaign20xx.blogspot.com/2015/01/dungeons-dragons-famous-dragon-lairs.html
You can also go to Adventure Lookup and do a search for 'Red Dragon' in the Boss Monster section.
People usually think volcano, but I like steam. My favorite red dragon lair is a side chamber the dragon carved off a steam tunnel. The steam damages anyone in it that is not immune to fire, and it obscures sight (which does not matter to the blindsight dragon).
As my dragons are ALL spellcasters and an adult red gets up to 5 5th level spells ...

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.