Blacksphere

Blacksphere was an abjuration/evocation spell that created a large sphere comprised of force energy centered upon a location of the caster's choosing.

Effects
When this spell was cast, a large black sphere of force appeared at a specified focal point, with a radius of 10' (3 m). It damaged anyone caught inside and unless they successfully resisted, trapped them for the spell's duration. These effects could be readily destroyed by any means that could damage a wall of force.

Blacksphere was the primary spell used in the creation of the rare beads of force. These items produced an effect that was quite similar to those created by this spell.

History
While it was unknown who originally formulated this spell, some scholars insisted that it was originally called Hilather's Blacksphere.

Components
In addition to verbal and somatic components, this spell required a small piece of coal and onyx.