Make a shadowy pact, healing the target and 4 other injured allies within 30 yds for (165% of Spell power). For 7 sec, your Shadow spells deal 25% increased damage and healing, and Halo, Divine Star, and Penance are converted to Shadow spells.
Shadow Covenant (scov) would typically be pressed before other damage abilities (such as pressing [Schism]) for the 25% shadow damage buff. It would also buff [Dark Reprimand], which was also a strong damage spell, especially with [Harsh Discipline] stacked up for extra bolts. This increased damage would also improve the healing converted from [Atonement].
The buff would also be strong with [Halo] for improving its direct raidwide healing by 25%, although its damage portion would only trigger Atonement once for the first enemy target hit. As the maximum duration of the buff is 15s and neither [Divine Star] nor [Halo] are affected by haste cooldown reduction, it would not be possible to cast more than one of Halo/Divine Star per shadow covenant buff.
Hotfix (2023-05-09):Fixed an issue causing [Halo] and [Divine Star] to not convert to Shadow spells when casting Shadow Covenant.
Patch 10.0.7 (2023-03-21): Fixed an issue causing Divine Star and Halo healing to not be increased from Shadow Covenant.
Patch 10.0.5 (2023-01-24): Now converts Penance to a Shadow spell.
Patch 10.0.0 (2022-10-25): Now converts Halo and Divine Star to Shadow spells instead of locking out all Holy spells. Now a row 5 Discipline talent (was a level 40 Discipline talent).
Patch 9.1.5 (2021-11-02): Healing increased by 10%, mana cost reduced by 10%, and duration lowered to 7 seconds (was 9 seconds).
Patch 9.0.1 (2020-10-13): Re-added and redesigned as a level 40 Discipline talent (was 75) – Make a shadowy pact, healing the target and 4 other injured allies within 30 yards. For 9 seconds, your Shadow spells deal 25% increased damage and healing, but you cannot cast Holy spells. 30 second cooldown, costs 5% base mana.
Previous: Draws on the power of shadow to heal up to 5 injured allies within 30 yds of the target for (450% of spell power), but leaves a shell on them that absorbs the next (225% of spell power) healing they receive within 6 sec.