Thestral

Thestrals have quite a disturbing appearance and are often described as being sinister and spooky. This is because they are seen as having big, bony figures and their dragon-like faces which bear white, glittering eyes that lacked both expression and pupils. Additionally, they are lured by the scent of blood, which is bad for their reputation.    Being a type of winged horse, most of their anatomy is identical to a horse, excluding their large wings that sprouted from their back. Thestral's wings do not possess any feathers at all; they have vast, black and leathery wings that were more similar to those of bats.    Their fleshless, lustrous bodies ae covered with a translucent and glossy coat. This smooth and dark skinis a bit slippery and so thin that Thestral's bones are clearly defined through the entire extension of their sleek bodies. These eerie horses have long black manes, as well as a large tail, either with flowing black hair, like horses or ending in a tuft, like zebras. Another distinction is their sharp fangs used to seize and slash their prey.

Thestrals are carnivorous and attracted to the smell of blood. They often attacked birds. This indicates that, naturally, they hunt not only for food on the ground, but also to pursue flying prey.

Thestrals are social creatures who live in herds. They are "dead clever". In fact, trained Thestrals are smart enough to understand their rider's words when they ask to travel to a specific location.   These magical creatures can be found in dark environments and the forest is their natural habitat. They communicate with each other through a shrill and strange shriek that resemble some sort of monstrous bird.    They appear to be loyal creatures, able to discern a friend from an enemy and offer help to humans in need of transportation. Thestrals will forcefully attack anyone or anything they see as a threat and in the unusual case of domesticated Thestrals, any enemy of its owners. Thestrals are not marks of ill omen, nor (their spooky appearance notwithstanding) are they in any way threatening to humans, always allowing for the fright that the first sight of them tend to give the observer.

The most well-known ability of these beasts is their invisibility to those who had not seen death. In other words, they are only visible to people who had seen someone dying and fully accept, understand and internalize the concept.    Thestrals have an extraordinary sense of smell and easily recognise the smell of blood and fresh flesh, even if the source of the scent is rather distanced.    They also have quite a useful sense of direction. The Thestral can understand exactly where their riders needs to go, even if the beast itself might or might not be familiar with the terminus in question. If their riders has a certain destination in mind, they only need to say the destination and the creature will diligently carry them to the intended location — much like owls do with letters.
These gentle, winged beasts are very capable and fast fliers and could travel long distances hardly beating their large wings. Their powerful wings are capable of lifting, at least, the burden of two humans. They can even lift something that weighs as much as them.