The great circle was a cooperative abjuration spell that four to twenty priests could use to cleanse an area of evil. The reverse of this spell, the black circle, could purge an area of good.
- ↑ 1.0 1.1 Cook, Findley, Herring, Kubasik, Sargent, Swan (1991). Tome of Magic 2nd edition. (TSR, Inc), p. 100. ISBN 1-56076-107-5.
- ↑ Richard Baker (1996). Player's Option: Spells & Magic. (TSR, Inc), p. 186. ISBN 0-7869-0394-5.