Foresight is a star within the Constellation The Apprentice in Elder Scrolls Online (ESO).
This was added in Update 6 with the Champion System. It reduces the Magicka cost of your next Spell by 80% after you drink a Potion. 75 points in the Apprentice Constellation are required to unlock it. Once unlocked the player will acquire this bonus automatically and across all characters on their account.