When cast, the spell caused a sphere of force, somewhat similar to the Otiluke's resilient sphere spell, to appear around a targeted created. The sphere constricted around the target and began to shrink. Within the sphere, the targeted creature was immobile, and thus unable to make the somatic gestures required for casting a spell, although they were able to cast a spell that required only verbal components. If the spell was cast on a creature from another plane, said creature was unable to return to it's plane of origin for the duration of the spell. The sphere's interior was lined with pseudo-pods of energy, which attacked the target. Some protective spells such as barkskin or shield reduced the amount of damage the targeted creature suffered but did not break the sphere itself. 
The spell was vulnerable to dispel magic, which instantly removed the sphere from around a targeted creature. If the sphere came into contact with a wall of force spell, the sphere consumed the wall, absorbing the force into itself and increasing the duration of the spell. If the sphere came into contact with a globe of invulnerability or any kind of prismatic spell, the result was an intense explosion which caused both spells to expire.
- ↑ 1.0 1.1 Richard Baker, Ed Bonny, Travis Stout (February 2005). Lost Empires of Faerûn. (Wizards of the Coast), p. 31. ISBN 0-7869-3654-1.
- ↑ 2.0 2.1 2.2 2.3 2.4 Ed Greenwood (March 1993). “Campaign Guide to Myth Drannor”. In Newton H. Ewell ed. The Ruins of Myth Drannor (TSR, Inc.), p. 52. ISBN 1-5607-6569-0.
- ↑ Ed Greenwood (March 1993). “Campaign Guide to Myth Drannor”. In Newton H. Ewell ed. The Ruins of Myth Drannor (TSR, Inc.), p. 47. ISBN 1-5607-6569-0.