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. Last 60 seconds at 10 intelligence. Each point of intelligence above 10 increase the duration by 15s (75s at 11 intell, 90s at 12 intell, 105 at 13 intell, etc). A weak version of Crystal Magic Weapon. Succeeded by Great Magic Weapon in terms of damage. Useful for early stages of game.