Mask of Deception - Lower Guk -
a ghoul assassin. NO TRADE, clickable from inventory.
Guise of the Deceiver - Shadow Haven -
King's Court Casino. NO TRADE, clickable from inventory by any class.
Burnoose of the Halfbreed - Jaggedpine Forest -
Zed Sticklebush. NO TRADE, must equip to use.
Amulet of Necropotence - Plane of Fear - multiple boss mobs. Tradeable, clickable from inventory by any class. Several other items also have illusion skeleton or illusoin frost bone skeleton, too many to list.
Crown of Deceit - Upper Guk - Quested:
Crown of Deceit. NO TRADE, clickable from inventory by any class.
Guise of the Coercer - Kithicor Forest - Quested:
Stanos' Head. NO TRADE, clickable from inventory.
Iksar Hide Mask - Trakanon's Teeth -
Harbinger Dronik. Tradeable, clickable from inventory.
Mask of Obtenebration - Charasis (Howling Stones) -
Skeletal Procurator. Tradeable, clickable from inventory.
Desiccated Halfling Mask - Chardok -
Overseer Dal'guur. NO TRADE, clickable from inventory.
Mask of Tinkering - No longer drops. Tradeable, clickable from inventory.
Besmirched Mask of Conception - Kerafyrm's Lair (Sleeper's Tomb) - Multiple Ancient dragon guardians. NO TRADE, must equip to use.
Flayed Barbarian Hide Mask - Kael Drakkel -
The Avatar of War. Tradeable, must equip to use.
Guise of the Hunter - Ssraeshza Temple -
Shissar Assassin. NO TRADE, clickable from inventory.
Circlet of Disguise - Vex Thal -
Kaas Thox Xi Aten Ha Ra. NO TRADE, clickable from inventory by any class.
Ball of Golem Clay - Vegarlson, the Earthen Badlands (PoEarth) -
A Korascian Warlord. NO TRADE, clickable from inventory by any class.
Visage of the Brute - Yxtta, Pulpit of Exiles - Quested:
Cragbeast Queen: Visage of the Brute. NO TRADE, clickable from inventory.
Guise of Horror - Crafted - Quested:
Guise of Horror. NO TRADE, must equip to use.
Guktan Pastwatch Eye - Dropped only during The War event.
Woven Shadow Stone - Dreadspire Keep: Demi-Plane of Blood -
Graniteclaw raid chest loot.
There are probably more but that's the majority of the ones I've seen.
Editing to add:
Veil of Flames - Vex Thal -
Diablo Xi Xin. NO TRADE, must equip to use, MNK/BRD/ROG/BST/BER usable.
Edited, Aug 2nd 2007 8:23pm by mfbrownbear Edited, Sep 28th 2007 1:18pm by mfbrownbear