Instead of plasmids (the power source in the first two games), so-called vigors are the source of Booker's environmental powers.

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But I need Salts to use Vigors, harkening back to the previous Bioshock games, where you need Eve to use plasmids.

FORBES: A Hands-On Demo of BioShock: Infinite

Plasmids are Vigors, EVE is Salts.

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