Lightning Overload

Lightning Overload is a passive talent that gives your Lightning Bolt and Chain Lightning spells {11/22/33}% chance to cast a second, similar spell on the same target with no cost. This second spell is instant, causes half damage and no threat.

Trivia

 * Lightning Overload is a Rare Shaman ability card in the World of Warcraft: Trading Card Game's Drums of War set.