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ed and al after that knows that the philosopher's stone is made out of the dead humans.After that ed and al promise that they won't use the human's scarifice to get they're bodies back.
The what are they looking for question is stupid. Their goal, as is made clear multiple times, is to get their bodies back. The Philosopher's Stone is a sub-goal, directly related to the main goal.
Okay, technically they were searching for the Philosophers stone *to* return their bodies back to normal. Just saying
Yeah, that's true, it's what I chose.