Selene Eiselstein
Aliases	The Philosopher's Catalyst Armony Eiselstein
Birthplace	New Hiessgart
Family	Wilhelm Eiselstein (father)
Abilities	Alchemy

Selene Eiselstein is the true daughter of Professor Eiselstein, and is no longer of this world. Edward and Alphonse, when they had visited the Professor with their teacher in the past, hadn't gotten to see Selene before they had left. Before the Professor informs them of what had happened to Selene, Edward believes that she was just being cold, but Al thinks that perhaps it was just too hard for her to say goodbye. Selene was always quiet, yet very intelligent and an alchemic prodigy.

Selene used to help her father with his alchemic experiments as he tried to obtain the legendary amplifier: the Philosopher's Catalyst. However, she got caught in a rebound from one of his attempts to create a prototype of the Catalyst, and her body mutated. As a result, the Catalyst, taking the form of a glowing white wing, fused with her and she became the girl Wilhelm now calls Armony. Armony however, having memories of playing with Selene as a child, has no knowledge of the fact that she (in a sense) is Selene, and believes that Selene was her older sister who had died. There is a grave for Selene at the church near Hiessgart that Armony often visits and leaves behind an Etherflower for her, but Armony does not know that the grave holds no body of her "sister".