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Message: <blockquote data-quote="Henry" data-source="post: 292233" data-attributes="member: 158">The Chaosium one, or the d20 one?The Chaosium system (also known as the BRP system) uses a pool of "magic points" that the caster has, and the caster must know the spell. If they know the spell, and have the magic points, they can cast it. If they go to zero magic points, they lose consciousness (from straining their force of will to cast the spell, or what have you). Most spells also have a sanity point cost to cast them - lose too much sanity, and you go insane.The d20 COC system uses temporary (and in some spells permanent) ability score loss to fuel the spells. Again, most spells also have a sanity point cost. Sanity in both versions work identically - it's a number between 1 and 100, and certain actions make you gain or lose sanity.</blockquote>