Blood-Mad Idol is a Unique Amulet in Diablo IV Season 15 for All classes. It comes from General Unique Pool; General Unique Pool - every Lair Boss (Initiate, Greater, Exalted, Belial) can drop it in addition to their dedicated table.
Unique power
You are always Berserking but take 200%[x] increased damage as Burning over 8 seconds. While Burning, Berserking grants an additional [80 - 100]%[x] increased damage.
Affixes
Primary Core Stat
Attack Speed
Where it drops
General Unique Pool
General Unique Pool - every Lair Boss (Initiate, Greater, Exalted, Belial) can drop it in addition to their dedicated table