Vhailor's Helm

Vhailor's Helm offers the wearer a bonus to armor class of -1 and he or she may also use the wizard spell Simulacrum once per day. The Nameless One and Vhailor are characters from Planescape: Torment. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. It can be bought from the lady in the Adventurer's Mart who sells unique items.

In-game description
"Vhailor's Helm This helmet was worn by a mysterious warrior named Vhailor. The warrior was destroyed while helping a creature known as the 'Nameless one'."