The Apple of Eden is the Assassin's Creed artifact associated with controlling minds. It is one of the Pieces of Eden, powerful relics created by the First Civilization, also known as the Isu.
In the series, Apples can influence perception, manipulate human behavior, and project energy. Their abilities vary by story and individual artifact, but mind control is one of their recurring functions. Templars seek these objects because they believe such power could impose peace through control.
The Apple is not the only Piece of Eden. Other examples include the Staff of Eden, the Sword of Eden, and the Shroud of Eden. The series also uses the word “apple” in a symbolic way, echoing the biblical imagery often associated with temptation and forbidden knowledge.