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Stamina is the green echelon above the amber action-point indicator.It recharges fairly rapidly over time, and is used for sliding (clerics), teleportation (wizards), and so on. It is important for a wizard to teleport quickly out of the heat of battle, or for a cleric to slide out of a power blow, or for the guardian fighter to parry an attack. Strength gives a boost to stamina recharge rate.