Omen of Pain is a Unique Ring in Diablo IV Season 15. It comes from 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
A dark aura surrounds you, inflicting Decrepify and Iron Maiden on enemies around you and increasing your damage to Close enemies by [10.0 - 15.0]%. Curses inflicted this way spread to surrounding targets every second.
Affixes
+Maximum Life
111 All Resist (inherent)
Where it drops
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