Invulnerability to Magical Weapons

This spell creates an immobile, faintly shimmering magical sphere around the caster that cannot be penetrated by magical blunt, edged, or missile weapons; all such weapons are harmlessly deflected (missile weapons strike the sphere, then immediately fall to the ground). However, the sphere offers no protection against magically-created creatures (such as golems) or from creatures whose attacks are magically based (such as the gaze of a medusa). The sphere offers no protection against spells such as Magic Missile, or spells that simulate the effects of weapons.
The caster can use magical weapons from inside the sphere to attack opponents normally. Spells can also be cast through the sphere. The sphere can be negated by dispel magic.

[Complete Wizard's Handbook]

School: Abjuration
Level: 6
Rarity: Uncommon

Range: 0
Components: V, M
Duration: 1 round/ level
Casting Time: 3
Area of Effect: 5-foot radius
Saving Throw: None

Material Components:
a piece of a broken magical weapon