The Widow Harun
Wyverns are found in many places in The Tuigan Empire, principally in scrubby ranges like The Uthangol Mountains. These poisonous dragon-kin were once simply a nuisance, but since the rise of Jebe Khan many of the more adventurous Tuigan have begun to capture the beasts and train them as flying mounts for the nomad lancers. At Demonblood Dam there are units composed entirely of wyvern riders, loyal to some of the remaining Noyan of Subedei Khatun. Elsewhere, Shaaran nomads hunt wyverns in the wild to harvest their poison glands and use or trade the toxin they produce.
Wyverns are discussed in more detail in the Forgotten Realms core books and supplements. Please consult these if you wish to learn more.