Morrowind:Fatigue

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The green Fatigue bar on the HUD display indicates your character's rested status. A character's fatigue indicator will decrease when they perform exercises such as running, jumping, or attacking, indicating roughly how tired they are.

A character's maximum fatigue is the sum of their Strength, Willpower, Agility, and Endurance.

Fatigue plays a part in many actions, so the lower a character's Fatigue gets, the more difficult it becomes to fight or cast spells effectively. A low fatigue will also reduce the height of your jumps.

Fatigue will regenerate over time as the character performs less strenuous actions, and can also be restored with Restore Fatigue potions, items, or spells.

Attributes in Morrowind
Primary:	Agility | Endurance | Intelligence | Luck | Personality | Speed | Strength | Willpower
Derived:	Health | Magicka | Fatigue | Encumbrance