Mordenkainen's Sword

Upon casting this spell, the wizard brings into being a shimmering, sword-like plane of force. The spellcaster is able to mentally wield this weapon (to the exclusion of all activities other than movement), causing it to move and strike as if it were being used by a fighter. The basic chance for Mordenkainen's sword to hit is the same as the chance for a sword wielded by a fighter of one-half the level of the spellcaster, e.g., if cast by a 14th-level wizard, the weapon has the same hit probability as a sword wielded by a 7th-level fighter. The sword has no magical attack bonuses, but it can hit nearly any sort of opponent, even those normally struck only by +3 weapons or those astral, ethereal, or out of phase. It hits any Armor Class on a roll of 19 or 20. It inflicts 5d4 points of damage to opponents of man-size or smaller, and 5d6 to opponents larger than man-sized. It lasts until the spell duration expires, a dispel magic is used successfully upon it, or its caster no longer desires it.

[Player's Handbook]

School: Evocation
Level: 7
Rarity: Uncommon

Range: 30 yards
Components: V, S, M
Duration: 1 round/level
Casting Time: 7
Area of Effect: Special
Saving Throw: None

Material Components: a miniature platinum sword with a grip and pommel of copper and zinc, which costs 500 gp to construct (consumed)