Fanfic / Fullmetal Alchemist Threads Of Time

Fullmetal Alchemist:Threads Of Time is a fanfic by Overnight FMA.

Basically this is a Fullmetal Alchemist AU in which it was Alphonse Elric who ended up with Automail limbs while Edward Elric wound up as a soul attached to a certain suit of armor.

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http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/FullmetalAlchemistThreadsOfTime