The Arkham Crown has been the badge of office for the Kings and Queens of Arkham Country for centuries.
The Silver Keys are a magical tool that opens the Gates of Slumber to the Dreamlands.
The dread book written by a mad sorcerer, the Necronomicon is the ultimate text on the Mythos.
A relic of the futuristic and alien Yithians, the Lightning Gun is a potent weapon.
The Pallid Mask only shows itself to those the King in Yellow deems worthy of receiving his power and becoming his vessel.