Witbane

Witbane is a disease that you can catch from fighting dogs and zombies.

You can also contract this disease from repeatedly being damaged by traps.

Effects (Morrowind)
Magicka recovers half as fast.

Effects (Oblivion)
Having Witbane affects you with the following:
 * Drain Attribute: Intelligence by 5.

Effects (Skyrim)
Witbane in Skyrim halves the rate Magicka replenishes at.

Cures
Witbane can be cured by:
 * Visiting any of the Altars of the Nine,
 * Casting the Restoration spell Cure Disease on yourself
 * Using any potion that has the Cure Disease effect.

Appearances

 * The Elder Scrolls III: Morrowind
 * The Elder Scrolls IV: Oblivion
 * The Elder Scrolls V: Skyrim