Avatar's- this was created by 'kamahpfan' all the credit goes to him/her
An avatar was a dark creature originally designed to serve Voldemort, however he grew afraid of the power they would wield so he killed them off before they came into their powers, however some may still exist.
An avatar is actually a human, who as a baby had many terrible things done to them by Voldemort making them into Overlords. This makes them immune to age, disease and poison. However due to what Voldemort did to them they also do not need to eat, sleep or breathe. As a matter of fact, they do not even need a heartbeat! Voldemort also made them immune to all curses, including the killing curse, however unlike a magus the curses do not reflect back at the caster. Avatars are also immune to dying from height, actually they are somewhat similar to cats, and they also have perfect balance, are extremely graceful and can jump 40 feet straight up. Avatar's are also completely without fear. Avatars can only die from being beheaded, however that would be a hard thing to do since they were designed for close combat. All avatars are in perfect physical shape and are around 7 feet 6 inches tall. They can lift 2 tonnes and can run at 60km/h pretty much forever, avatars almost never get tired. Avatars can also turn invisible at will and they never make a sound. Also like magi, avatars can perform wandless, wordless magic and can shapeshift. Also like magi, the sooner an avatar comes into their powers the more powerful they are. Avatars can also turn into smoke and appear in another place (much like a phoenix). Avatars can also read minds and can feel emotions (empathy) they can also project their thoughts to others (telepathy). Avatars also have perfect vision, even at night and have perfect hearing as well. Avatars also have a perfect memory and can read auras and follow a person's magical 'sense' or aura. Avatars can also regenerate lost limbs (if their arm is cut off it will grow back completely with in 2 minutes). Avatars also gain power from the moon and gain power from dark curses. However they are weaker against patronouses. They also gain power from silver and are immune to the effects of dementors. They are also resistant to the elements and have a complete immunity to fire. Avatars also have the ability to control fire and make it immune to water, they can also control lightning.
In their natural form avatars are quite terrifying, they have pitch-black eyes and shoulder-length black hair. Their voice is also extremely deep (much like Darth Vader but without the raspy breathing). They also have only 3 toes, however those toes have 2-inch claws coming out of them. They also have one, one inch claw coming out of the back of their foot (they have elongated feet). Avatars also have slightly bent knees so that they can perfectly balance on the balls of their feet. They also have silvery/ivory skin and their fingers have one-inch claws coming out of them. They also have 1½-inch long canine teeth on both the bottom and top of their head, they also have an elongated head. Avatars also have pointed ears; much like elves and they have bulging muscles all over their body. However the most terrifying thing about an avatar is the two, 2-inch long bronze horns sprouting from their forehead. They also have a long black tail with a pointed tip, much like a demons and they have long black feathery wings with traces of violet, burgundy and navy blue sprouting from the shoulder blades.