Adamantite dragons are perhaps the mightiest of dragonkind. They are the epitome of good, sacrificing whatever is necessary for the common good of intelligent creatures everywhere.
These other-planar creatures are strange among dragonkind, since they are born with their shining coats of adamantite fully developed (explaining their very low armor class even when hatchlings). This mighty coat is a shining silver color that reflects light in brilliant, scintillating beams and rainbows refreshing to those who can bask in its goodness, painful to those who hide in the shadows of evil.
Adamantite dragons speak their own tongue and the language of all good dragons. By their juvenile years (age category 4), they will speak common. By the time they are adults (age category 6), they are 50% likely to speak any language of dragonkind.