The Unforgivable Curses are some of the most powerful Dark Arts spells known. Commonly used by the books' villains, such as Lord Voldemort and the Death Eaters and in some cases the Ministry of Magic, their use inspires horror and great fear amongst others. The curses are so named because their use is - except by Ministry of Magic authorisation - forbidden and unforgivable in the Wizarding World. Use of any of these spells on any human being can carry a life-sentence in the magical wizard's prison of Azkaban. These curses are thus very rarely used openly. However, in Harry Potter and the Deathly Hallows, the Unforgivable Curses are used liberally by good characters, ranging from Professor McGonagall with the Imperius Curse, to Harry Potter effectively using the Cruciatus Curse. He also uses the Imperius curse on a goblin and a suspicious Death Eater during their disguised attack upon Gringotts Bank. Since the spells are very powerful, their use requires a strong desire to bring about the effects, a directed will, and great skill. However, it is notable that Harry, though he kills Lord Voldemort, does so without the use of a Killing Curse and indeed never performs any, at least in the course of the book.The use of the Unforgivable Curses was authorized against Lord Voldemort and his followers by Bartemius Crouch Sr, during the First Wizarding (or Voldemort) War. Although not stated, it is possible that this was limited to the Imperius Curse (to force a Death Eater to submit to questioning or surrender) and to the Killing Curse (as a last resort). Shortly after his resurrection, Lord Voldemort names two Death Eaters "killed by Aurors".
The Avada Kedavra Curse causes instant death that is never explainable. When the curse strikes a non-living object, the energy is released in a small explosion at the point of impact. If the material struck is flammable, the curse starts a fire of greenish flames. The extent of damage from the curse when used on a phoenix is uncertain, as the primary trait of a phoenix is self-resurrection. It seems to merely start the phoenix's current resurrection cycle over again. Albus Dumbledore's pet phoenix named Fawkes is seen to swallow a killing curse in Harry Potter and the Order of the Phoenix.
Am i right Professor Albus Dumbledore