Advanced Derelict-Purple Indestructible Crystal

Advanced Derelict-Purple Indestructible Crystal is a level 10 artifact Cartel Market endurance based color crystal that can be added to a character's weapon.

Source
Advanced Derelict-Purple Indestructible Crystals can be obtained from Regulator's Contraband Packs and Enforcer's Contraband Packs in the Cartel Market.