Magic

Magic is a very broad term in reference to Crawl, potentially referring to many things. An overview of the relevant articles is as follows:

Player spellcasting

Refers to the ability of players to memorize and cast spells. See:

Overview

• Spell
• Spell school
• Spell book

Mechanics

• Spell memorisation
• Spell success
• Spell power
• Magic contamination
• Spell noise
• Spell hunger
• Miscast effect

Lists

• List of spells
• List of spells by school
• List of spells by flag

Monster spellcasting

Refers to the ability of monsters to cast spells. Note that many monster abilities which are thematically 'innate' are actually implemented as spells in Crawl. The following articles and categories provide useful info:

• The article on player ghosts provides a good insight into how monster spells are treated.
• Actual spells (monsters that don't cast spells innately)
• Spellcaster

Magic items

Many items in Crawl are, thematically, magical. A complete list would be quite long, but they include:

• Rings
• Amulets
• Scrolls
• Evocable items. These include:
  • Wands
  • Magical staves
  • Summoning items, including elemental evokers
  • A few other miscellaneous items
• Armour bearing an ego
• Weapons bearing a brand
• All artefacts (the last non-magical one, the Knife of Accuracy, was removed in 0.13