Hohenheim's Circle Gives Amestris Its Souls Back
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Prepared across the country over centuries
Hohenheim has spent centuries communicating with the souls inside his
Philosopher's Stone body and placing portions of that power around Amestris.
When Father activates the national transmutation, Hohenheim's countermeasure reverses the mass extraction and returns the population's souls to their bodies.
Why it matters
Hohenheim defeats Father's first victory using the thing that most separates them. Father treats souls as fuel. Hohenheim learned their names, spoke to them and acts with their cooperation.
The Five Human Sacrifices Are Gate-Openers
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Ed · Al · Izumi · Hohenheim · Mustang
Father needs five people with a connection to the Gate.
Edward, Alphonse and Izumi opened it through
human transmutation. Hohenheim's existence is bound to the Xerxes transmutation that created Father's present form. Mustang is the missing piece, so Pride and Wrath force him through a human transmutation against his will.
Why it matters
Father cannot simply choose five powerful alchemists. The Gate experience is the qualification, which turns the heroes' past mistakes into infrastructure for somebody else's plan.