Defiler Cuisses are legendary pants in Diablo III, added in patch 2.6.0. They require character level 42 to drop, and can only be used by Necromancers.
The unique affix effect is multiplicative, and stacks as long as Bone Spirit is chasing its mark, or even remains out without one, for up to 5 seconds total. Each Spirit will have its own calculation of bonus damage, reset when it actually deals damage.
As of patch 2.7.0, it also makes the Bone Spirit Freeze its target on hit.
Stats (Level 70)[]

Defiler Cuisses
Legendary Pants
- 660 - 759 Armor
Properties:
- Bone Spirit's damage is increased by 400% - 500% for every second it is active, up to 5 seconds, and it Freezes target on hit.
- +416 - 500 Intelligence
- +3 Random Magic Properties
- 2 Empty Sockets
Walk as though you are one with the night.