Dropped by
a Boombottom observer (Runnyeye: The Gathering)
a bottomless gnawer (Charasis: Maiden's Chamber)
a hollow bulbous sifter (Moors of Ykesha)
a Jarsath jibsnapper (Jarsath Wastes)
a Sandscrawler guest (Runnyeye: The Gathering)
a stinging spined succulent (Jarsath Wastes)
a terrorspine shark (Jarsath Wastes)
a Void lamia (Obelisk of Ahkzul)
a Yha-lei fouler (Fens of Nathsar)
a Ykeshan snapper (Moors of Ykesha)
Aimedaca (Miragul's Phylactery: The Crucible)
an abyssal sentinel (Obelisk of Ahkzul)
an ancient reanimator (Kurn's Tower)
an eternal maul (Ward of Elements)
Benach Aglebar (Ward of Elements)
Corpus Amygdalus (Miragul's Phylactery: The Anathema)
Dayakara (Ward of Elements)
Digg (Ward of Elements)
Dread Exarch Mordek (Befallen: Necrotic Asylum)
Executor Vark (Obelisk of Ahkzul)
Executor Zynos (Anchor of Bazzul)
Firelord Kaern (The Deep Forge)
Flame Pillar (Najena's Hollow Tower)
Gelidus Ventus (Ward of Elements)
Ghoz the Brutal (Anchor of Bazzul)
Haggle Baron Klok (Kurn's Tower)
Imperator Ignus (Ward of Elements)
Lord Marcus Thex (Evernight Abbey)
Magus Vein'ca (Anchor of Bazzul)
Majora Leviathora (Chelsith)
Nightfall (Emperor's Athenaeum)
Patriae Vykel (Miragul's Phylactery: The Anathema)
Primogen Daishirou (Mistmyr Manor)
Shade of Miragul (Miragul's Phylactery: Scion of Ice)
T'Lon the Powermonger (Ravenscale Repository)
The Codexicon (Miragul's Phylactery: The Crucible)
The Eidolon of Depravity (Befallen: Halls of the Forsaken)
The Reformed Magolemus (Najena's Hollow Tower)
Trogoldon Greck (The Ruins of Guk: Ykesha's Outer Stronghold)
Tuz'Rak (Nu'roga)
Yourself (Miragul's Phylactery: The Anathema)

Confirmed Locations
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Mobs that drop this item also drop