World of Sharr
Manna is the measure of one’s currently available magic power. This is what is used to power most of the magical actions that Wysers, and others, make. A character’s base manna is determined by and equal to its Power score. This may be increased through EXP expenditure at a rate of 3:1. Every 3 points of EXP spent is one point added to a character’s max manna. A character’s max manna may never be higher than twice said character’s Power score – some special exemptions applicable. In addition, some powers and effects may require or allow multiple points of manna be spent at a time, or a character may wish to perform multiple manna-consuming actions at once. In such a case, a character may never spend more than his or her Power score at one time without incurring penalties from overexerting (typically in the form of damage).