Chromatic blade

Chromatic blade was an arcane alteration spell that created a special magical blade that changed colors.

Effects
The colors of the blade shifted constantly. Touching any part of the blade would cause instant harm. The weapon itself was weightless and could be wielded by anyone, though the caster could will it out of existence at any point. Though small, a chromatic blade could sever limbs just like a sword of sharpness. It could only be destroyed by successfully dispelling it, or by disintegration or a limited wish. The blade would also shatter upon severing the limb of anyone wearing heavily enchanted armor.

The wielder of a chromatic blade was protected from all color spray attacks including prismatic spray. The blade would destroy one layer or color of a prismatic sphere upon contact but then be destroyed.

Components
In addition to verbal and somatic components, this spell required as a material component a small lightning-forged dagger set with gems of all seven spectrum colors to cast.

History
This spell was found in the tome Tasso's Arcanabula.