Create a shroud of death at your location for 30 seconds. While you remain within the shroud, your ranged damage will be increased by 50%. If your target stands within the shroud, they will be hit for 10% to 20% of weapon damage every 2 seconds.
Death's Swiftness is an ultimate ability found on the ranged tab in the ability book. It is received as a reward for completing the quest The World Wakes.
For 30 seconds, a 3x3 shroud around the user is created, dealing 10-20% weapon damage every 2 seconds to any enemy in contact while also increasing the user's ranged damage by 50% inside.
A good strategy is to use Natural Instinct, then quickly build back to full adrenaline and use Death's Swiftness. The effect of Natural Instinct will still be lingering, allowing the player to build up to half adrenaline quickly and use powerful thresholds abilities like Rapid Fire or Snap-Shot with a 50% damage boost. This is even more effective when combined with Adrenaline potions or a ring of vigour.