Part of the Stormcaller's Garb set:

The set gives these bonuses as more pieces are worn: 3: Your Lightning Bolt, Chain Lightning, and Shock spells have a 20% chance to grant up to 50 Nature damage to spells for 8 sec. 5: -0.4 seconds on the casting time of your Chain Heal spell. Set Details | All Sets

Disenchants into

Name	Value	Drop%
Nexus Crystal	1 Copper	100.0%