Chromatic drakes are a rare breed — only a few exist because Nefarian's research has not yet been going on long enough for it to have produced any chromatic adults naturally. The only chromatic drakes that do exist presumably have been aged by some unnatural means. Regardless, Nefarian has created only a handful of these monsters, and they are undoubtedly among the deadliest of all dragons (if not all living creatures in general).
Like the younger dragons of their flight, chromatic drakes' minds are bent to Nefarian’s will, and they serve him loyally and without question.
Chromatic drakes fight with the same general tactics as chromatic dragon whelps, using different breath weapons until they find one that is most effective. Additionally, some are trained to use magic to augment their attacks and defenses, but they focus on melee after a few spells. Chromatic drakes speak Draconic, and some speak Common as well.