Otiluke's Diamond Screen

This spell creates an immobile glittering screen of energy of any color chosen by the caster. All creatures passing through the screen are attacked by a multitude of razor-sharp blades made of substance drawn from the Quasi-Plane of Mineral. Each creature suffers 3d20 points of damage no matter what its Armor Class. The spell can be shaped as the caster wishes (typically a screen of 20 x 20 feet).

The material component is a collection of sharp diamond chips worth at least 5,000 gp, and these vanish after the spell is cast.

Notes: Uncommon or rare spell (WoG).