Vimian Deer

The Vimian Deer or the Vimian are a breed of Cervidae that serve as the main mount used by Elven cultures all around the globe. For very good reasons, these Vimian Deer serve as both overly efficient mounts but have had close relationships in the religion and spirtuality of the elven race since its inception. The Vimian has always represented eterntal beauty followed by swift and merciless death, as the Vimian Deer shares many aging qualities with Elves. They live for roughly one hundred years, one of the longest lived Cervidae of their kind, and then at age 100 they drop dead after a period of rapid aging over the last year of their life.
This kinship with the elves have made Vimian a sacred animal, and many laws are in place across elven nations to protect the species from any sort of merciless act such as harvesting them for their meat. Elven weapons and other such equipment often are decorated by shaped fragments of the antler sheds of these creatures, and the antlers of young bucks are often taken to be worn by elven men as a common fashion statement.
They come in a myriad of colors from all black to all white, to brown dappled, coming in about as many patterns as you would usually see in horses, yet unlike the elves they are extremely fertile and can have up to one hudnred and fifty offspring over the course of their entire lives. It is very common for Vimian deer to have twins, and for a Vimian to have a single child is usually an omen of bad fortune to the family.
Vimian Deer meat is said to taste bland and is tough to the taste, so even as much as humans would likely love to spit on this part of Elven culture as well, the meat is so thin and so disgusting it isn't worth the hastle even to round up these beasts for slaughter. A trait which in hindsight which was likely bred into them by the Elves to make their mounts even less appealing to those who would seek to harm them such as predators.