[frogspawner]

OK, you've shown yours, so I'll show mine...

Method 3: "Magic"-skill based system

• Mages have the skill of Magic, starting at roughly INT%
• Max Spell Level castable = Magic skill / 10 (drop fractions)
• Magic Points = (INT-2)/2 x Max Spell Level castable
• One spell per point of INT can be memorized.
• Spells costs 1 MP per spell level
• Spells can be intensified by expending more MP than the default (which is the spell level), up to the caster's Max Spell Level castable.
• The effects of a spell are as the D20 descriptions, but "level of caster" equals the number of MP expended.
• When casting a spell, make a Magic skill-roll: Success = normal success; Fail = Half Effect (damage/duration/overcoming-POW); Special = No MP loss; Critical = No MP loss and Double one effect; Fumble = roll on an amusing table...
• Learning a spell is a month-long task that has a chance of success equal to: (30 / (Spell Level+1)) x (Magic Skill - 10xSpell Level)
• Oh and, since it's difficult, Magic skill only increases 1% each time. Sorry!

And...

Method 4: "Holiness"-skill based system

• Priests have Holiness (aka Allegiance<religion>), starting at roughly POW%
• Max Spell Level invokable = Holiness skill / 10 (drop fractions)
• Magic Points = (POW-6)/2 x Max Spell Level invokable
• Spells (aka Miracles) do not require learning/memorizing/pre-booking - all the religion's spells are available
• Spells cost 1 MP per spell level
• Spells cannot be intensified by the invoker
• The effects of a spell are as the D20 descriptions, but "level of caster" equals the invoker's Max Spell Level castable.
• But beneficial miracles only have half-effect on non-worshippers
• When casting a spell, make a POWx5 roll: Success = normal success; Fail = no effect (no MP loss); and there are no special/criticals/fumbles.
• An Increase roll for Holiness may be attempted when the priest attempts increase rolls for FIVE cult skills and/or cult personality traits at once
• Oh and, since it's also difficult, Holiness skill only increases 1% each time, too. Sorry again!