The caster creates a black blade-shaped planar rift, resembling a greatsword which fights at her side and can move up to 90 feet/round. The blade cannot be harmed by physical attacks, but it can be affected by dispel magic or similar effects. For the purpose of bypassing damage reduction, the sword has an enhancement bonus equal to your intelligence bonus or your charisma bonus (for wizards and sorcerers respectively) to a maximum of +20. The blade can cut through all magical barriers and attacks twice/round. The blade does 1D12x10 damage to inanimate objects and 2D12 to living creatures.
The spell requires the caster to concentrate on it — casting spells may result in a concentration failure and end the spell.
(as transcribed from the 2e Wizard's Handbook)
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