- Unlocked at Siphoning rank 20.
- U6: This ability no longer affects attack speed. In addition, if your target dies while affected by Debilitate, the cost of the spell is refunded to you. 
- U6: Fixed an issue where the Synergy (Purify) for Cleansing Ritual wasn't removing the effects from Crippling Grasp. 
- U4: As of Update 4, this ability no longer removes the Nightblade active skill, Shadow Cloak 
- As of Update 5, using this ability will no longer reveal you if you have Shadow Cloak activated. 
- U6: Increased the damage dealt by Cripple by 6%.