 If you liked
Fullmetal Alchemist
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 ...then you might like
Rengoku Hime
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Temporary objects and spells could be created through the poisonous gas "ren" in Rengoku Hime, sort of like alchemy. "Ren" is deadly to the human body so users must balance it's effectiveness and the amount of usage, similar to FMA's concept "equal value exchange". There are also tactical battles involving the usage of "ren", which is similar to the battles in FMA that involve alchemy. Both series has homunculus.