True dragons with varied metallic appearance that changes with environment and age

Cloud dragons have the most varied appearance of all the true dragons. In an indoor environment or when underground a cloud dragon appears to be a bright metallic color, while outdoors their coloration is brighter and less metallic, and may take on a reddish or bluish cast reminiscent of a sunrise or sunset. Hatchlings have a coppery skin tone, brightening to silver at the second age category, then to gold at the fourth before fading to a platinum tone by age category 6. While most true dragons become duller in color and sheen as they age, cloud dragons do not. Cloud dragons are not cruel and do not seek to kill for pleasure. Many tales are told of cloud dragons offering assistance to adventurers, though they are every bit as avaricious as any dragon; adventurers in need of gold need not bother asking for a loan. Another way in which cloud dragons differ from other types is that they do not have fixed breath weapons. Upon reaching the second age category, a cloud dragon acquires the breath weapon of a randomly-chosen (or GM assigned) dragon type; upon reaching the fourth age category, they acquire a second breath weapon type. Cloud dragons possess the same immunities as the drago