Summoner's Insight (Season 2012 Mastery)

Summoner's Insight is a first tier defense mastery with 1 rank.

Effect per rank
Improves the following summoner spells:
 * Reduces cast time by 1 second.
 * Increases promoted minion's bonus defensive stats by 15%.
 * Reduces cooldown by 15 seconds.
 * Increases mana restored by 20%.
 * Increases duration by 2 seconds.