The core conflict of Arcanum is the incompatibility of Magic and Technology. A wizard can’t ride a train without it breaking down; a gunslinger can’t drink a health potion without it failing.
The brilliance of the Arcanum manual begins with its narrator. Unlike the dry, technical manuals of its peers ("Press W to move forward"), the Arcanum manual is written from the perspective of a character living inside the world. arcanum manual
In occult/esoteric traditions, an “arcanum” (plural: arcana) refers to a secret or mystery. The (22 cards in Tarot) and Minor Arcana (56 cards) have extensive manuals: The core conflict of Arcanum is the incompatibility
If you mean the for the cult classic RPG Arcanum , that’s a 100+ page PDF that came with the game. It includes: arcanum manual