magic was formally introduced in the 2nd edition Player's Handbook (1989) and then greatly expanded on in The Complete Wizard's Handbook (1990). Jeff Howard, in his book Game Magic: A Designer's Guide to Magic Systems in Theory and Practice, highlights that the schools of magic do not "necessarily refer to an academic institution for learning and teaching" but rather "schools of magic constitute a taxonomy of reality, in the sense of methodical and ordered classification of the chaos of existence and experience into a structured and order whole. The domains are aspects of existence over which various spells operate". In 4th edition, spell schools are initially absent but were reintroduced with the Dungeons & Dragons Essentials supplement. The spell schools introduced are Enchantment, Evocation, Illusion, Necromancy, and Nethermancy (corresponding to the Shadow subschool of the Illusion school from the previous editions). The spells of other classical schools are present in the form of utility spells (like True Seeing being available but not being specifically named a Divination spell) or spell descriptors (like Conjuration or Summoning). Dweomer In Dungeons & Dragons, a dweomer () is an aura of magic; especially that which enchanted items radiate. Gary Gygax encountered the Middle English word dweomercræft in Susan Kelz Sperling's book Poplollies & Bellibones: A Celebration of Lost Words (1977), where it is defined as "the art of magic or juggling." Gygax invented such derivations as dweomered, dweomercræfter, and dweomercræfting. Other forms of magic Magic in campaign settings Dark Sun In the Dark Sun campaign setting, arcane magic draws its power from the life force of plants or living creatures, with the potential to cause tremendous harm to the environment. Arcane spellcasters may cast spells in a manner that preserves nature, known as preservers, or in a manner that destroys it, known as defilers. However, any arcane caster may choose to defile at any time. As a result, wizards and other arcane casters are despised and must practice in secret. Due to the scarcity of natural resources on the fictional planet Athas, few wizards have access to books made of paper pages and hard covers; instead, they record their spells with string patterns and complex knots. Psionics are extremely common with nearly every living thing having at least a modicum of psionic ability. Unlike arcane magic, psionic abilities are accepted and revered in every strata of Athasian society. Athas has no deities and no