Halaster's Blacksphere

(City of Splendors: Waterdeep)

Evocation [Force]
Level: Sorcerer 8, Wizard 8,
Components: V, S, M,
Casting Time: 1 action
Range: Medium (100 ft. + 10 ft./level)
Area: 10-ft.-radius burst and globe
Duration: 2d4 rounds + 1 round/level
Saving Throw: Reflex half; see text
Spell Resistance: Yes

This spell creates a burst of black force.
The force burst causes 1d6 points of force damage per caster level (maximum 20d6) and envelops the affected area in a sphere of force with a radius of 10 feet, trapping creatures within.
A successful Reflex save reduces the damage by half and negates the entrapment effect.
Creatures trapped inside cannot escape except by those methods that can bypass or destroy a wall of force.
This spell can be used in lieu of wall of force as part of creating a bead of force.
Material Components: A small piece of charcoal and a small piece of onyx.