Dragons

Dragons are a race of powerful, long-lived, and intelligent reptilian creatures which are said to be the oldest living things in Urva and to have been born from the scattered teeth of the cruel god Kharax following his destruction in the primordial wars of the Old Gods. True dragons may grow to titanic size (several hundred feet long with wingspans to match) and live for millennia; they are also very rare. Over the ages, a wide array of smaller or otherwise less formidable varieties of dragon-kind have proliferated, and these degenerate diminuations now certainly far outnumber of the true dragons. 
Drakes is the general term for any smaller, and always much less intelligent, variety of dragon kind. They may range from bird-sized to more than fifty feet long (which obviously means they can still be incredibly dangerous). Drakes are typically winged and capable of flight, but most cannot spit fire or lightning like true dragons. They generally possess only an animal level of cunning, but when one considers that animals such as dogs, apes, or porpoises can be extremely clever, they should not be underestimated. Most drakes do still possess a vestigial or instinctive remnant of a true dragon’s lust for gold and gems, so they will still sometimes accumulate treasure hoards in their lairs, and small ones may line their nests with coins and trinkets they've found. Sea-drakes are a notable variety, often iridescently scaled and with translucent membranous wings; they like to make their lairs on crags or cliffs overlooking the ocean, or on rocky islands. They typically hunt fish and seabirds, but those that grow large enough can take sharks, small whales, giant turtles, and other such prey (as well as unfortunate sailors or fishermen). Notable populations of sea-drakes include the small but numerous examples that roost on the shores of the Dragon’s Jaw (from which it takes its name) and the much bigger varieties that are common around Azhir’s shores, the Sea of Wyrms (likewise named after them), and the Western Isles. Wyverns are a sort of drake distinguished by a venomous stinger on the tip of their tail.
Achuirean dragons are both wingless and flameless, and like drakes, possessed of only animal intelligence. However they can grow to be very large, in some cases nearly as big as true dragons. 
Sea serpents, which lack both wings and legs and are likewise flameless, are also considered by scholars to be a degenerate form of dragon-kind.