Arcane Barb

Arcane Barb is a crafted legendary crossbow in Diablo III. It requires character level 70 to be used. The level 57 crafted equivalent is the Starspine.

Predictably, it has a guaranteed Arcane Damage bonus.

Crafting
Starspine can be crafted using the Plan: Arcane Barb, 64000 gold, 20 Reusable Parts, 20 Arcane Dust, 30 Veiled Crystals, Corrupted Angel Flesh and Westmarch Holy Water.

Prior to patch 2.0.6., it also required one Eternal Power Capsule that dropped only from unique Cuddle Bears in Whimsyshire.