Magic Power

Magic Power, also known as Magic Attack, MPow, or just Magic, is the stat that determines the amount of damage a character can do when casting a spell. Usually, it works in conjunction with a spell's inherent Spell Power. Characters with high Magic Power usually have low Attack Power and vice-versa.

Often, Magic Power is the function of Intelligence, another recurring statistic.

Final Fantasy VII
Magic determines the strength of Magic spells. It can be upgraded with the Magic Source item.

Crisis Core -Final Fantasy VII-
Magic determines the power of Zack's spells.

Final Fantasy XI
Magic Attack is an unseen stat that affects the power of direct damage spells such as Blizzard. Black Mages typically have the highest Magic Attack due to their Magic Attack Bonus.

Final Fantasy XII
Magic Power serves the same role in most other games. It determines the damage of magic attacks, effectiveness of stat-altering magic, and healing power of healing spells. It also boosts the power of Katanas and Maces.

Final Fantasy Tactics
Magic Power determines the power of spells, which is also boosted by the character's Faith stat.