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Message: <blockquote data-quote="marli" data-source="post: 5908686" data-attributes="member: 86402">I'm building. A rpg system and am currently have a magic system based on d20.  However I've converted combat and combat and skills system to d% to speed up in game usage while.,  so want to change magic to match. Currently the system works as below each player has between 1 and 35 mana points per adventure average is about 5 to 10.to cast a spell a player chooses to spend 1 to 19 points. They they then have to roll equal or under to cast the spell. They can repeat the roll as many times as they like to increase the power of the spell. If they roll a 18 they suffer 1 wound. If they roll an 19 the spells target is redirected by the DM (initally favourable but collect to many 19s then the targeting gets more and more negetive-eg non enemies, innocents, allied.,) rolling a 20 and the spell fails and the caster takes 10 wounds. Rolling 18 or 19 AND rolling equal or lower to your target does not mean you cannot roll againif you roll a 20 on your first roll nothing happens. Now how would you convert this to a single d% roll? I have some ideas which I'll post later to not distort other people's thinking</blockquote>