After being hit enought and the frostbite bar fills, it slows stamina recovery and movement/attack speed. Cannot be infused or buffed onto a weapon and the only weapon I know of having this affect is the Irithyll Straight Sword and Irithyll Rapier (Straight Sword --> Rapier --> ) 

 Also the Pontiff Knight Great Scythe, when using the weapon art and the Vordt's Great Hammer

          <---- Straight Sword                                                                                                                                                    Rapier -->

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