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

Fullmetal Alchemist: Brotherhood Flame of Vengeance - Watch on Crunchyroll

Fullmetal Alchemist Brotherhood: The Promised Day Board Game — Square Enix - PHD Games

Chapter 1: The Two Alchemists, Fullmetal Alchemist Wiki

Ling Yao, Fullmetal Alchemist Wiki

Demons: Sloth — Nathan Writes Things

Chapter 36: Alchemist in Distress, Fullmetal Alchemist Wiki

FMA Brotherhood - The promised day (epic ending)

Riza Hawkeye, Fullmetal Alchemist Wiki

Pride, Wiki