Adelard of Bath’s Abacus

Origin
Adelard of Bath was a natural philosopher that translated many Greek and Arabic texts on astronomy, philosophy and mathematics into Latin. He was also one of the first to introduce the Hindu-Arabic number system to Europe, which is still commonly used throughout the world. In the pipe roll of Henry I, (English treasurer’s financial records), Adelard had the fine on a murder charge waived.

Effects
When used in calculations, it will increase the person’s mathematical and computing capacities. They will be able to perform complex physics and calculus problems quickly in their head. If someone irritates them, it may cause the user to ‘hunt’ them and wait for an attempt to murder them.