Magicka (Oblivion)

Magicka is the amount of an actor's magic that is used to cast spells. Each cast subtracts an amount of Magicka to power it. You cannot cast spells if you currently have the Silence effect active on you. In the game of Morrowind, there is a chance that the casting will fail, in which case the Magicka points are still lost.

In Oblivion, instead of failing to cast a spell, skill level plays in the way that the more complex spells require a higher level in the specific magic school skill. Your total amount of Magicka is determined by your Intelligence attribute and can be boosted with a Fortify Magicka effect.

Magicka regeneration is driven by the character's Willpower attribute. In the game of Morrowind, your Magicka regenerates only when you sleep, rest or travel by Silt Strider. In Oblivion, however, Magicka regeneration is practically instantaneous yielding use of magic much more appealing.

This only happens, if you do not currently have the Stunted Magicka effect which can be cast on you or given as a symptom of a disease you have contracted, and characters of the Atronach birthsign have built-in. Magicka can also be absorbed, damaged or drained.