Spell Absorption is a star within the Constellation The Lady in Elder Scrolls Online.
This was added in Update 6 with the Champion System. Restores (3360) Magicka (at VR14) when you take Flame, Frost, Shock, Magic, Earth or Oblivion Damage equivalent to 30% of your Health. This can only occur once every 10 seconds. 10 points in the Lady Constellation are required to unlock it. Once unlocked the player will acquire this bonus automatically and across all characters on their account.