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The Persuader is an item in Ratchet & Clank which provides a one third discount to weapon prices at Gadgetron vendors. It was originally designed by Fred, a gadget engineer that Ratchet and Clank met at the Blarg Tactical Research Station, to control minds, but fails to do so. The Persuader is acquired on Pokitaru, where Ratchet and Clank can find Fred in the sewers and obtain the Persuader in exchange for granting him Raritanium (found on Hoven).

These are not the droids you're looking for

The bronze trophy These are not the droids you are looking for… is granted in the high-definition re-release of Ratchet & Clank, also available in Ratchet & Clank Collection, by obtaining the Persuader.