Powder of Ibn-Ghazi
From Arkham Horror Wiki
Powder of Ibn-Ghazi is a unique item. It first appeared in the Arkham Horror board game.
Card info
Type: Magical weapon
Bonus: +9 Combat check (Lose 1 Sanity and discard after use)
Hands: 2
Price: $6
Mythos Source
The Powder of Ibn-Ghazi appears in the story The Dunwich Horror, written by H.P. Lovecraft (1929).