The Gloom Ward is a Unique Shield in Diablo IV Season 15. It comes from Harbinger of Hatred (Lord of Hatred Lair Boss) per one guide; Random world drop / any Lair Boss (one guide: 'drops at any Difficulty Tier, increased drop rate per Torment tier'); 3.2.1: all Uniques drop from level 1 in any Difficulty; targetable via Horadric Cube reroll.
Unique power
Shadow damage infects enemies with Shadowblight for 2 seconds. Every 6th time an enemy receives Shadow damage from you while they are affected by Shadowblight, they take an additional [500 - 600]% of that damage as Corrupting damage over 4 seconds.
Affixes
20.0% Block Chance
+100% Main Hand Weapon Damage
+1-2 to Darkness Skills
Where it drops
Harbinger of Hatred (Lord of Hatred Lair Boss) per one guide
Random world drop / any Lair Boss (one guide: 'drops at any Difficulty Tier, increased drop rate per Torment tier'); 3.2.1: all Uniques drop from level 1 in any Difficulty; targetable via Horadric Cube reroll