Dropped by
a Boombottom observer (Runnyeye: The Gathering)
a bottomless feaster (Charasis: Maiden's Chamber)
a bottomless feaster (Charasis: Vault of Eternal Sleep)
a crypt enforcer (The Crypt of Agony)
a crypt juggernaut (The Crypt of Agony)
a Durus decapitator (Jarsath Wastes)
a Gazing Petrifier (Jarsath Wastes)
a helot spectre (Charasis: Vault of Eternal Sleep)
a jade construct (Kunzar Jungle)
a pyre golem (Charasis: Vault of Eternal Sleep)
a Runnyeye guard (Runnyeye: The Gathering)
a Sathirian archon (Sebilis)
a Sathirian patron (Sebilis)
a spectral protector (Karnor's Castle)
an agitated corpse (The Crypt of Agony)
an agitated protector (The Crypt of Agony)
an iksar insurgent (Jarsath Wastes)
an unearthed dragoon (Jarsath Wastes)
Arch Duke Latol (The Crypt of Agony)
Baron Yosig (The Crypt of Agony)
Gorehoof (Jarsath Wastes)
Gruplinort (The Crypt of Agony)
Guardian of Eternity (Charasis: Vault of Eternal Sleep)
Harbringer Freglor (The Crypt of Agony)
Hierophant Prime Grekal (The Crypt of Agony)
Librarian Zimor (The Crypt of Agony)
Runnyeye defender (Runnyeye: The Gathering)
The Keeper of Dreams (Charasis: Vault of Eternal Sleep)
The Keeper of Nightmares (Charasis: Vault of Eternal Sleep)
Warlord Zon'Kir (Jarsath Wastes)

Confirmed Locations
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Mobs that drop this item also drop