The Promised Day, Fullmetal Alchemist Wiki

The Promised Day refers to the coming time of the long-awaited culmination of Father's four-hundred year plan involving Amestris, the Human Sacrifices, the Philosopher's Stone and the Nationwide Transmutation Circle. It was first mentioned by Father during his first appearance in the manga as a toast to his faithful children before quaffing Greed's Philosopher Stone heart back into himself and has since been mentioned sparingly and with few details. It appears, due to his excitement regarding it

Human Sacrifice, Fullmetal Alchemist Wiki

Episode 49: Filial Affection (2009 series), Fullmetal Alchemist Wiki

Steam Workshop::Fullmetal Alchemist: The Promised Day

the promised day.

Chapter 106: Pride's Abyss, Fullmetal Alchemist Wiki

Pride, Wiki

Fullmetal Alchemist: Brotherhood, Fullmetal Alchemist Wiki

Scar/History, Fullmetal Alchemist Wiki

List of Fullmetal Alchemist characters - Wikipedia

Van Hohenheim, Fullmetal Alchemist Wiki