Dis: A tale of Life and Death
The wyvern is a lizard with a one pair of wings and one pair of legs native to Nim-Yola. They grow to about ten feet in height, with a wingspan of up to fifteen feet. Wyverns are solitary predators. Elementals bred with them to produce dragons. The ice age three thousand years ago nearly drove them into extinction, but dragons provided warmth and food for some of them through that era. Since the end of the ice age, the wyvern population has rebounded, though their diversity has been reduced because of that genetic bottleneck.
Art by Wizards of the Coast.