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Rules, limitations, abilities, and characteristics that define magic in a game

Magic systems in games are the rules, limitations, abilities, and characteristics that define magic in a game.

A magic point, sometimes known as a mana point, often abbreviated to MP, is a unit of measure that indicates either or both the amount of magic that can be utilized by a user, and the amount of energy that they can harness to perform magic. A magic point system is the most common method used to regulate and thus limit the number of spells that a magical individual can cast. Such a system gives magic users a specific amount of MP, and each spell causes a specific number of magic points to be consumed upon being cast. Many systems that use magic points assign a magic user a maximum number of MP that they can have at any one time, which is different for each magic user. There is typically a way to restore lost MP, usually by resting or imbibing potions. Sometimes consuming certain foods may replenish MP. A few systems that use MP do not have a maximum number that may be stored, but instead make it more difficult to recover or gain new magic points. Examples of MP limited systems include Rolemaster, High Adventure Role Playing, GURPS, and Tunnels & Trolls.

A skill limited magic system breaks the spells down into a number of skills. To perform skills usually requires skill checks: a dice roll, modified by character statistics. The more difficult the magical effect, the higher the difficulty of the die roll. Such systems are often limited by an increase in the difficulty of the skill roll based upon the number of spells in a certain time period that have already been cast. It is common in skill limited systems for a spellcaster to be able to combine multiple magical skills to perform effects not covered by the skills given. Typically, such combinations are more difficult than the basic uses of the skills. Examples of skill limited systems include Talislanta and Ars Magica.