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Message: <blockquote data-quote="WaterRabbit" data-source="post: 67089" data-attributes="member: 2445">DC for spellsA first level human can have a Spell Craft check of 4+AB+SF or +6 or +7 (if you set skill focus to be +3).At 10th level this can be 13+AB+SF+MB or +20/21 (plus bonuses due to magic items like talismans).If you set DC = 10 + SL, your range is 10-19.So the question is "Do you want magic to be really easy to cast ?"If magic is difficult to cast, if would suggest:Caster Level Check (d20+CL) against DC 10 + 2*SL.If you want Spellcraft to make a difference, give a +1/5 ranks synergy bonus to the caster level check.This gives, at 1st level, a d20+1 against DCs 11-28 (0 levels spells are treated as a half level).At 10th level we have a d20+10 against the same DCs.  With the suggested synergy bonus that could be a d20+12.In the Buffyverse magic is generally hard to master and there is always the risk of failure.  So you could add some modifiers like cooperative casting uses the Aid another rules.  CLC against a DC 10 to grant a +2 bonus, etc.  You can also add in that a natural "1" on the caster level check is always a failure and a natural "20" always succeeds.To model someone like Willow, who has a strong natural talent for magic, you can create a feat like Natural Witch which gives a bonus to the caster level check.Also Relics and Rituals has ideas for ritual and cooperative spell casting.Just some considerations.</blockquote>