Magic Weapon is a Sorcery in Dark Souls 2. To cast a Sorcery, you must use a Staff or Special Weapons that can cast Sorcery.
"Sorcery that imbues weapon in other hand with magic. Adds magic damage to the types of damage the weapon already inflicts.
Wielding a sword and casting a sorcery are two different things, and some members of the Melfian Magic Academy view these varieties of spells as impure."
- Carhillion of the Fold for 2000 Souls
- Buffs weapon with magic damage. Duration scales with Intelligence: 63 sec. at 10 Int, and up to 135 sec. at 15 Int. Weaker than Great Magic Weapon and Crystal Magic Weapon.
- Despite being the weakest Weapon Buff in the game, it's low stat requirement and high spell uses/duration makes it a great way to deal extra damage without spending souls for resins or having to level intelligence any more than you might need to use it's large variety of support sorceries.
- DS2's buff formula differs from other Souls games, instead relying primarily on the targeted weapon's base damage to determinate how much AR the spell buff will add. Matching the spell buff with a damage type present on a weapon will add a flat bonus to the total AR, depending on whatever the weapon is infused with and/or naturally inflicts said damage type. A small scaling bonus is also added, unless the targeted weapon doesn't scale at all with any stats.