Indira's Memory is a Unique Pants 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
Blood Wave is additionally a Bone Skill. It spawns a Bone Prison at its end point and increases your Blood Skill damage by [20 - 40]% for 8 seconds when Cast. All Bone Spears are additionally Blood Skills. Your Bone Spears consume a Corpse to launch another Bone Spear and drain 10% of your Maximum Life.
Affixes
+77.5-115.0% Overpower Damage
+Intelligence
+Maximum Life
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