The Magic section is part of the main rulebook and serves as an overview of Magic. The Warhammer Magic supplement from 1996 expands further: Wizards and Spells, Special Spells, Spells Summary, Magic Items, Further Ideas and Spells

All magic comes from the alternate dimension that sorcerers call Chaos. Its natural inhabitants are daemons - creatures made of pure magic - and its greatest powers are the mighty gods of Chaos. These are immeasurably potent entities given life and form by the nightmares, subconscious terrors and insane ambitions of mortal creatures.

In places where the fabric of the universe is weak raw magic leaks into the Warhammer World. Some mortals seek to bind and control this force, believing that they can use magic to gain wealth, power and prestige. Such individuals are either very wise or utter fools, earnest scholars or dabblers in things that are better left untouched.