When it came time to translate the rather cut-and-dried stuff of Chainmail’s “Fantasy Supplement” to D&D, far more selection and flexibility had to be delivered, for the latter game was free-form. This required me to back up several steps to a point where the figure began a career which would eventually bring him or her to the state where they would equal (and eventually exceed) a Chainmail wizard. Similarly, some basis for the use of magic had to be created so that a system of spell acquisition could be devised. Where should the magic power come from? Literature gave many possible answers, but most were unsuitable for a game, for they demanded that the spell-caster spend an inordinate amount of time preparing the spell. No viable adventurer character could be devised where a week or two of preliminary steps were demanded for the conjuration of some not particularly mighty spell. On the other hand, spell-casters could not be given license to
broadcast magic whenever and wherever they chose.
This left me with two major areas to select from. The internal power, or manna, system where each spell-caster uses energy from within to effect magic, requires assigning a total point value to each such character’s manna, and a cost in points to each spell. It is tedious to keep track of, difficult to police, and allows Magic-Users far too much freedom where a broad range of spells are given. If spell points were to be used, it would require that either selection be limited or all other characters and monsters be strengthened. Otherwise, spell-users woud quickly come to dominate the game, and participants would desire to play only that class of character. (As a point of reference, readers are referred to the handling of psionic abilities as originally treated in Eldritch Wizardry. Therein, psionic manna was assumed, the internal power usable to tap external sources, and the range of possible powers thus usable was sharply limited.)
Having read widely in the fantasy genre since 1950, I opted instead for the oft-used system which assumes that magic comes from power locked within certain words and phrases which are uttered to release the force. This mnemonic power system was exceedingly well articulated by Jack Vance in his superb The Eyes of The Overworld and Dying Earth novels, as well as in various short stories. In memorizing the magical words, the brain of the would-be spell-caster is taxed by the charged force of these syllables. To increase capacity, the spell-caster must undergo training, study, and mental discipline.