"The Law of Equivalent what?" Lloyd echoed the turn of phrase blankly. Inwardly, though, he was tensing. Ed had trapped Al's soul somehow, keeping it from leaving the world, and now they were talking about some kind of stone. He knew, logically, that they weren't from his world, but the pieces felt connected anyway, and stood too similar to things he already understood for him to ignore easily.

His hand clenched, then he held it out, letting them both get a good look at the Exsphere mounted on the back. His gut twisted uneasily. "A Philosopher's Stone... It isn't one of these, is it?"