SRD:Mithral Full Plate of Speed
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Mithral Full Plate of Speed: As a free action, the wearer of this fine set of +1 mithral full plate can activate it, enabling her to act as though affected by a haste spell for up to 10 rounds each day. The duration of the haste effect need not be consecutive rounds.
Speed while wearing a suit of mithral full plate is 20 feet for Medium creatures, or 15 feet for Small. The armor has an arcane spell failure chance of 25%, a maximum Dexterity bonus of +3, and an armor check penalty of –3. It is considered medium armor and weighs 25 pounds.