Black River is a Unique Scythe 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
Corpse Explosion consumes up to 4 additional Corpses around the initial Corpse, gaining [120 - 160]%[x] damage and [42.0 - 50.0]% Size per additional Corpse consumed.
Affixes
+30.0-50.0% Chance for Corpse Explosion to Hit Twice
+1-3 to Corpse Skills
+35-94 Intelligence
1.10 Attacks per Second (Fast)
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