While in Void Metamorphosis, every 30 Soul Fragments harvested grants access to Collapsing Star.
Collapsing Star
Channel an immense amount of void energy into a single, cataclysmic blast, dealing 2,385 Cosmic damage to your target and 1,831 Cosmic damage to all nearby enemies. Damage reduced beyond 8 targets.
While casting Collapsing Star, your Fury drain is significantly reduced.