Second Wind

If you are reduced to one-half your maximum hit points or less you can catch a second wind as a swift action. This action heals one-quarter of your full hit point total (rounded down) or a number of hit points equal to your Constitution score, whichever is greater. You can catch a second wind only once per day. Certain feats or talents may allow you to catch a second wind more often, but never more than once in a single encounter.
Only heroic characters can catch a second wind; nonheroic characters, creatures, objects, devices, and vehicles cannot. Exception: A nonheroic character that takes the Extra Second Wind feat can catch a second wind once per day.

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