The Spider Queen's Grasp

The Spider Queen's Grasp is a Legendary Ceremonial Knife for the Witch Doctor in Diablo III. It requires character level 29 to drop. In patch 2.0, it replaced the Ziggurat Tooth.

Essentially it adds a Slow effect to the Corpse Spiders on every attack, creating a web (roughly 5 yards radius) at the impact location of the jar, lasting 5 seconds. In addition, it also offers Corpse Spiders the largest skill damage increase in game.

Trivia

 * The description is a possible reference to the Crazed Hermit's words about accepting Araneae's 'blessing' (that is, her venom).