Dropped by
a bottomless gnawer (Charasis: Maiden's Chamber)
a chaotic inkling (Miragul's Phylactery: Scion of Ice)
a disturbed cadaver (Befallen: Cavern of the Afflicted)
a Durus flayer (Jarsath Wastes)
a furious spark (Miragul's Phylactery: The Anathema)
a gnashing devourer (Jarsath Wastes)
a Jarsath jibsnapper (Jarsath Wastes)
a malicious manifest (Miragul's Phylactery: Scion of Ice)
a Sathirian researcher (Sebilis)
a skyfire wurm (Jarsath Wastes)
a spectral nullifier (Obelisk of Ahkzul)
a terrorspine shark (Jarsath Wastes)
a Void lamia (Obelisk of Ahkzul)
a Yha-lei fouler (Fens of Nathsar)
a Yha-lei patroller (Jarsath Wastes)
Aimedaca (Miragul's Phylactery: The Crucible)
an abyssal sentinel (Obelisk of Ahkzul)
an eternal maul (Ward of Elements)
an unfathomable feaster (Charasis: Maiden's Chamber)
Arcanus (Miragul's Phylactery: Scion of Ice)
Arch-bishop Joltan (Befallen: Halls of the Forsaken)
Cruhm the Overseer (The Deep Forge)
Dayakara (Ward of Elements)
Firelord Kaern (The Deep Forge)
Fitzfangle (Najena's Hollow Tower)
Flame Pillar (Najena's Hollow Tower)
Imperator Ignus (Ward of Elements)
Jailor Ca'iluer (Najena's Hollow Tower)
Lord Marcus Thex (Evernight Abbey)
Magus Vein'ca (Anchor of Bazzul)
Maldormous Exeter (Palace of Ferzhul)
Master of the Embalmers (Emperor's Athenaeum)
Nightfall (Emperor's Athenaeum)
Ra'zul the Gallery Curator (Mistmyr Manor)
Sanedrac the Lost (Emperor Atrebe's Laboratory: The Fabled City of Kor-sha)
The Codexicon (Miragul's Phylactery: The Crucible)
The Master (Miragul's Phylactery: The Crucible)

Confirmed Locations
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Mobs that drop this item also drop