0: The Resurrection Stone
“The Resurrection Stone was one of the Deathly Hallows, and the second said to be created by Death in The Tale of the Three Brothers, right after he created the Elder Wand. According to legend, whoever united it with the Elder Wand and the Cloak of Invisibility would be the Master of Death. It was either created by, or given by Death to, Cadmus Peverell, the second of the Peverell brothers, it had the power to bring people back from the dead, but only as clearly-defined spirits who disappear the moment the Stone is released.”
“Then the second brother, who was an arrogant man, decided that he wanted to humiliate Death still further, and asked for the power to recall others from Death”
—”The Tale of the Three Brothers”