Thunderfury, Blessed Blade of the Windseeker

Thunderfury, Blessed Blade of the Windseeker is a Legendary sword in Diablo III. It requires Character Level 31 to drop.

Its most valuable ability, in addition to a guaranteed Socket, is a Chain Lightning 'on hit' effect, which greatly increases the effective damage output, and in addition, slows the monsters enough that frail players have an enhanced opening to get in a safer position. Its internal cooldown seems to be very little, if any. The chance appears to be equal to the Proc Coefficient.

Synergies

 * Wyrdward

Trivia
A blade of the same name (and with similar appearance) exists in Blizzard Entertainment's Warcraft series.