Slime wrote:
I use it with +5 DC if the crafter doesn't have the Caster Level (or equiv. threw craft ranks and Master Craftman) and another +5 DC if he does have the spell available.
So a 7th level Fighter (with the 7 ranks) can make a Giant Bane weapon at +10 DC or only +5 if a friend can supply the casting of Monster Summoning. Since most groups have characters of the same level the caster level of the spell source and the crafter should mostly be the same anyway. You shouldn't bypass all prerequisite in a single +5 penalty otherwise it would have been a shorter text.
By what reasoning do you arrive at this interpretation?
You are correct that it does say "The DC to create a magic item increases by +5 for each prerequisite the caster does not meet." But, many magic items have multiple spell prerequisites. We cannot necessarily infer that the possibility of multiple bypassed prerequisites is to allow for the inclusion of the caster level.
Note that the passage that causes the problem opens with "Note that all items have prerequisites in their descriptions."...
From this, you could credibly argue that the +5 DC to bypass prerequisites rule only applies to prerequisites listed in the description field. The requirement to possess the requisite caster level ISN'T in the description field, its listed under the Magic Item Creation heading 80-some odd pages away from the item descriptions. It does list the caster level of each item in those descriptions, but not with the requirements. They're set apart from the requirements in the description just like the magic item's aura as revealed by a Detect Magic spell.
To be clear, I'm not saying your interpretation is necessarily wrong. I'm just saying that there are at least three possible, equally logical interpretations:
1) The DC goes up for each requirement the crafter cannot meet personally, meaning for each spell taken from another source. The caster level must be met to even try, since it does not say caster level requirements may be filled by proxy.
2) The DC goes up for each requirement the crafter cannot meet at all, meaning each spell totally missing. Spells taken from other sources do NOT effect the DC. The caster level must be met to even try, since the caster level requirement is not part of the prerequisites listed in the effect description.
3) The DC goes up for each requirement the crafter cannot meet at all, meaning each spell totally missing. Spells taken from other sources do NOT effect the DC. The caster level requirement may be bypassed as well by increasing the DC, since the caster level requirement is itself a prerequisite and subject to the same rule as the spell requirement.
All three possible conclusions are equally supported by the text, and I haven't seen any other passages that would seem to support one interpretation over another.