Legendary RE: Wailing Quiver
Your Arcane Shot is transformed into Black Shot, dealing Shadow damage instead, which triggers Shadow Embrace (if learned) and increases the damage of Black Arrow by 15%. Black Shot criticals extend the duration of Black Arrow by 3 seconds and grant you Swift Darkness, which increases your spell haste by 5%, stacking up to 3 times.
Dealing damage with Shadow Word: Pain while Piercing Shots is active has a 30% chance to grant you Wailing Quiver, allowing your next Aimed Shot or Multi-Shot to deal extra damage based on your Shadow spell damage and increasing your ranged attack speed by 15% for 10 seconds.
Dealing damage with any shot empowered by Wailing Quiver refreshes Curse of Agony while maintaining its current damage level and grants you a Mark of Torment, which guarantees your next Black Shot to critically hit.
Killing an enemy afflicted by Black Arrow refreshes its cooldown and applies Curse of Agony to all enemies within 10 yards.
(Requires a bow and does not work with Hunter pets or demons. <- it would make sense themewise)
^ improved version of an RE i suggested a while ago: https://forum.ascension.gg/topic/88/legendary-re-dark-precision/6
Love it, great theme and the numbers sound reasonable.