Sapphire dragons usually inhabit any subterranean areas. They are geniuses when compared to other dragons and consider themselves lawful neutral in alignment.
While not actively hostile, sapphire dragons are militantly territorial and initially distrustful of anyone who approaches.
Sapphire dragons generally observe intruders before deciding what to do with them, unless known enemies such as drow or dwarves as present. If the dragon or its treasure is threatened, it attacks immediately with breath weapon, spells, and physical attacks.
Sapphire dragons live deep underground. They sometimes share territory with emerald dragons. Sapphire dragons treat their young well, but force them to leave and find their own territory as soon as they are young adults.
Sapphire dragons consider giant spiders a great delicacy and often hunt them. Deep dragons, drow, dwarves, mind flayers, and aboleth are great enemies of sapphire dragons.