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Constitution represents your Player Character’s health and stamina. A Constitution bonus increases a character’s hit points, so the ability is important for all classes.

You apply your character’s Constitution modifier to:

* The number of Hit points you get each level.
* Fortitude saving throws, for resisting poison and similar threats.
* Concentration checks. Concentration is a skill, important to spell casters, that has Constitution as its key ability.

If a character’s Constitution score changes enough to alter his or her Constitution modifier, the character’s hit points also increase or decrease accordingly.