Othnal's Spectral Dagger

This spell consumes an edged metal weapon of any size, sort, or condition, creating a translucent dagger-shaped blade of force; this can glow (as the faerie fire spell) or not as the caster wills. Initially, the blade is nearly invisible (30% likely to be noticed).

The spectral dagger appears wherever the caster desires within spell range, and moves as the caster wills, at a rate of 12, striking twice per round with the caster's THAC0 but with a +3 bonus. It can strike creatures vulnerable to weapons of +3 enchantment, and deals 1d4+3 points of damage per strike.

Although concentration is not required to maintain the spell, it is required to make the dagger attack (see shadow-hand).