Gene Tonics are special serums made from processed ADAM that introduce modified stem cells into the body, allowing for genetic modification and mutation, giving the user what some might call "super powers". In BioShock 2 Multiplayer, the player is able to choose from a selection of up to seventeen Tonics, and equip three of them per loadout. Even though Tonics have three classifications (combat, physical, and engineering), they can be mixed in any number from any classification up to the maximum. Rather than being purchased or found, Tonics are automatically rewarded after reaching a certain Rank.
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Hitting an enemy from behind deals more damage.
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Obtained at Rank 11
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The users attacks deal more damage to Big Daddies.
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Obtained at Rank 36
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The rate of fire is increased for Turrets hacked by the user.
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Obtained at Rank 32
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The user's body becomes a time bomb after death.
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Obtained at Rank 38
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Reduces the amount of EVE used when casting Plasmids.
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Obtained at Rank 7
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More than halves the time needed to research an enemy corpse.
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Obtained at Rank 3
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The user's speed is slightly increased and their footsteps make less noise.
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Obtained at Rank 30
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Increases the damage of headshots.
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Obtained at Rank 34
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The user can charge their jumps, increasing their height.
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Obtained at Rank 28
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The user slowly regenerates EVE over time.
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Obtained at Rank 15
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Grants the ability to repair destroyed Turrets.
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Obtained at Rank 22
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Upon death, resurrects the user with a small portion of their health.
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Obtained at Rank 40
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The user's attacks deal more damage to Turrets.
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Obtained at Rank 19
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Decreases enemy Turret accuracy against the user.
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Obtained at Rank 3
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Grants the ability to charge melee attacks.
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Obtained at Rank 26
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Hacking Turrets and Vending Machines takes less time.
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Obtained at Rank 24
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Increases the user's health regeneration rate.
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Obtained at Rank 7
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