An enormous flying reptile whose wingspan can exceed 30 feet, a ti-khana giant pterosaur bears little resemblance to any natural pterosaur. They can vary greatly in appearance depending on the whims and donor creatures the yuan-ti used to create them. A typical yuan-ti giant pterosaur resembles an oversized Pteranodon with teeth lining its long stabbing beak and a tail that ends in a triangular stabilizer. The pterosaur usually has naked leathery skin covered in small scales, but some have bodies covered in feather-hair like a normal pterosaur. It does not have the flat-soled hind feet of a Pteranodon, which are rather human-like and built for walking, but raptorial taloned feet like a hawk's.

Flying Attack Dogs. Ti-khana giant pterosaurs are often used as attack beasts by yuan-ti, who train them to respond to whistles or flag signals. 

Winged Predators. A ti-khana giant pterosaur is a carnivore and they are not fussy about what flesh they eat, whether it's a living victim or decaying carrion. They normally hunt prey of Medium size or smaller, preferring Small creatures the size of sheep. The giant pterosaur is able to seize victims of up to human size in its hawk-like talons and carry them into the air, where it will savage them with its jaws or hurl them to the ground. They also like to make flyby attacks: slashing with their beaks and flying away before their target can respond.

Aerial Mounts. Some elite yuan-ti ride ti-khana giant pterosaurs, usually using them as scouting and combat platforms. These creatures can carry up to 480 pounds through the air, the weight of a couple of Medium sized creatures, although they cannot fly very far with such a load.

Feral Populations. Despite their wildly varying appearance and bloodlines, ti-khana pterosaurs are able to breed with others of their kind and lands of savage, mountainous jungle support wild populations of them. Feral ti-khana pterosaurs tend to slowly lose their ti-khana traits over the generations. Many have lost their Innate Spellcasting and/or Shapechanging abilities and are less intelligent than true ti-khana, with brains no more developed than a normal pterosaur's, but they often keep their other ti-khana traits such as Magic Resistance. No matter how devolved a feral ti-khana pterosaur becomes, it always retains its venomous bite.

Creatures of the Yuan-ti. Over millennia of experimentation, the yuan-ti have transformed various scaly reptilian animals into monstrosities that share some of their traits. Called ti-khana, these prized pets are carefully trained to serve their ophidian masters. All ti-khana are resistant to magic like yuan-ti and possess the innate ability to detect magic. The majority of ti-khana also have venomous fangs, the ability to transform into a poisonous snake, and some kind of supernatural or magical attack.

Ti-khana require the dark magic and alchemy of the yuan-ti to breed and develop their powers. Ti-khana can survive in the wild, but it is unlikely they can reproduce properly without the yuan-ti's arcane treatments. It is possible some types of ti-khana can mate with their unaltered relatives or lay viable eggs with their own kind. However, feral offspring can not develop ti-khana abilities without yuan-ti intervention so, at best, would grow into beasts resembling the ti-khana's mundane ancestors.

Breeding and training ti-khana is usually performed by specialist yuan-ti spellcasters, but an edifice can be enchanted to perform this task for one or more strains of ti-khana. This allows ancient yuan-ti sites to have a population of ti-khana "guarddogs" even if no yuan-ti has visited them for millennia.

(Based on a monster from the Fiend Folio (2003).)