Terrorbound Nexus

• Terrorbound Nexus
• Mythic
• Item Level 50
• Binds when picked up
• Unique-Equipped
• Trinket
• +9 Mastery
• Equip: Your melee attacks have a chance to unleash 4 Shadow Waves that deal 104,762 Shadow damage to enemies in their path. The waves travel 15 yards away from you, and then return.
• Requires Level 40
• Sell Price: 49 53 67

Source

This item drops from General Xakal in The Arcway.

Patch changes

• Patch 7.1.0 (2016-10-25): Damage effect should no longer hit targets that are crowd-controlled.
  
• Patch 7.0.3 (2016-07-19): Added.
  

External links

• Wowhead
• WoWDB