Damage (Oblivion)

Damage lets the caster shoot out magical energy which lowers the value of a target's attributes, Health, Magicka or Fatigue. Damaged attributes can only be restored with a Restore effect spell or potion. The magnitude is the units lost each second of duration. (Oblivion Instruction Manual)

Damage Sub-Types
Damage sub-types are elemental which can mean increased or decreased damage for some enemies who may be vulnerable or resistant to that particular element.
 * Fire Damage
 * Shock Damage
 * Frost Damage