Tressym

A tressym was a magical beast resembling a small winged cat. They could be found across the warm and temperate lands of Faerûn, and were most common in northern Cormyr, particularly in the village of Eveningstar where they were seen as good luck charms and mascots and praised for keeping down rodents. They were also popular as familiars for good wizards.

Description
A tressym resembled a small cat, roughly the size of a common housecat, and growing up to 2 feet (61 centimeters) long from nose to tail. Their primary feature was of course their wings.

Extending from their well-muscled shoulders, these wings were formed like a bat's, being divided into arc-segments by hollow elongated "finger" bones. However, the leathery membranes between these bones were covered in feathers. These wings had a maximum wingspan of 3 feet (0.9 meters).

Tressym were fluffy and their coat varied in color and length as much as regular cats. The majority were short-haired, with black, gray, or tabby fur.

They were widely considered to be cute or beautiful.

Traits
A tressym was classified as a magical beast.

Combining the sensory abilities of the cat and the owl and a magical beast, the tressym was equipped with a number of natural and supernatural senses. First, they had the cat's native ability to find and follow a scent. To see in the dark, they possessed infravision or darkvision, as well as the ability to see in low-light conditions. Furthermore, they had the ability to sense invisible creatures and objects up to 90 feet (27 meters) away. Finally, through either taste, touch, or scent, they could also detect poisons that were harmful to the sentient folk of the world.

However, tressym were themselves immune to apparently every known kind of poison, suffering no ill effects whatsoever. This ability could be conferred to other creatures, however.

Tressym had skills in stealth, climbing, balance, and alertness comparable to a regular cat, but were of course a little better at balancing and climbing owing to their wings. However, they didn't have nearly the same talent for jumping.

Their wings were not strong enough to carry great weights. They could not carry a halfing; if a halfling was falling, a tressym might strain to haul them up, and could do little more than slow, but not brake, their fall.

Behavior
Tressyms were highly intelligent, being a little above average human intelligence. They could not speak human languages,  but had their own language, tressymspeak, which was based on purrs and growls. They were semi-wild, and most people thought of them as "mischievous little terrors", but otherwise tended to be shy and skittish.

They were often solitary creatures, rarely living or hunting with others of their kind, though did usually get along fine. Some bonded with individuals of other races, like elves and humans, forming close friendships. Stories told of heroic tressym sacrificing themselves to save beloved companions. Equally, they could have strong hatreds of those they disliked. They enjoyed teasing dogs (which could not give chase) but not to the point of danger. They ignored and left in peace birds (when not preying upon them), griffons, and other flying creatures. However, they were deadly rivals to stirges and manticores, to the point that packs of tressym would gather to combat them.

Combat
Like ordinary cats, tressym typically stalked and pounced on their prey, using their claws and fangs to slay it. However, the ability to fly gave them a new dimension to hunt in and made them much more dangerous to birds and insects. They could also get into aerial catfights.

Otherwise, they avoided fighting with anything larger than themselves, by flying away and hiding. If pursued by larger flying creature, then they would go to ground and seek a small hole or crevice to conceal themselves in.

Nevertheless, they were cunning and quick learners, knowing enough to scratch a foe's eyes and soon learning the danger of weapons and wands held by people.

Ecology
Tressym were carnivorous, like cats, usually hunting birds, rodents, and insects. However, they did not prey on baby birds or eggs.

They mated as often as regular cats, and did not mate for life. Tressym were closely related to the small feral cats that prowled the forests of the Heartlands, which had been domesticated across Faerûn, from the Sword Coast to Cormyr, the Dalelands, Sembia, and the Moonsea. Thus tressym could even mate with normal cats, with which they were fully fertile. However, on average, only 10% of mixed-bred kittens would winged, while the rest were wingless.

In good health and without accidents or hazards, a tressym could live over twenty years.

Locations
In the wild, they could be found in warm and temperate lands. They could easily find and take shelter from bad winter weather, or fly away from it entirely.

Individual wild and domestic tressym could be found all over Faerûn, albeit very rarely. They only appeared to gather and breed in large numbers in northern Cormyr, mostly lairing in Starwater Gorge. Night and day, they hunted the fields for rodents, avoiding the local cats and dogs and not fighting or teasing them.

Tressym were relatively common in the nearby village of Eveningstar, found prowling the streets and perched in the trees. They were highly appreciated by both the villagers and the local farmers for their control of rodents in the fields. Folk saw them as mascots and good luck signs, and fed them and gave them free run of the village. while trying to limit their vandalism and airborne catfights. Mages regularly came to Eveningstar seeking a tressym as a familiar, but the locals tried to stop large-scale and magical trapping of them.

There were a number of tressym in the city of Ankhapur on the Lake of Steam, in southern Faerûn. Curiously, on the day before Highsummer each year, every tressym in the city mysteriously disappeared and only returned three days later.

Uses
Tressym were sometimes kept as familiars by wizards and sorcerers. They needed to be experienced mages capable of bonding with a more advanced creature, and the tressym would only accept a good-hearted master. As familiars, tressym combined the senses of cat and owl, and furthermore were intelligent enough for many more tasks, being able to carry and operate complicated and delicate items to the limit of capability, to fully observe and report on events, to concentrate on activities without distractions, and to safely identify poisons and toxic gases.

Thus many mages, particularly good ones, sought out tressym, often coming to Eveningstar to find them. Two mages living in Eveningstar kept tressym as familiars, Lord Tessaril Winter and Maea Dulgussir. Tsarra Chaadren of Waterdeep also had, called "Nameless".

History
The tressym were believed to the product of a wizard's experimentation long ago.

However, it wasn't until the Year of the Tressym, 1263 DR, that they became widespread in Faerûn. As the name of the year suggested, this had been foretold by Alaundo the Seer himself, writing in the Year of the Clinging Death, 75 DR.

Notable tressym

 * Nameless