Deathwish

Deathwish is a Legendary sword in Diablo III, one of the five Quinblades, added in patch 2.4.0 (though it was present in game files since patch 2.1). It requires character level 70 to drop.

The unique affix boosts all channeled Wizard skills, increasing their damage output multiplicatively. Other damage sources benefit from it as well, though it may be hard to use them simultaneously with channeling a skill (though Etched Sigil solves that issue).

As of patch 2.6.8, the effect only works after 1 second of channeling.

Trivia

 * It is the only Quinblade that is not functionally limited to the element it represents (Arcane in this case).