
CE Chef |

This is taken from the Magic Item creation section of the D20PFSRD
Note that all items have prerequisites in their descriptions. These prerequisites must be met for the item to be created. Most of the time, they take the form of spells that must be known by the item's creator (although access through another magic item or spellcaster is allowed). The DC to create a magic item increases by 5 for each prerequisite the caster does not meet. The only exception to this is the requisite item creation feat, which is mandatory. ((In addition, you cannot create potions, spell-trigger, or spell-completion magic items without meeting its prerequisites.))
I placed the parenthesizes over the relevant section.
Scrolls are spell completion items.
The Cooperative Crafting feat says that either one of the creators can satisfy the prerequisite so long as both have the relevant craft skill, or item creation feat. So, as long as the cleric has this feat, and craft Caligraphy, it looks legal to me since the cleric can satisfy the "know this spell" prerequisite.

Gauss |

CE Chef, this would not be the first time a feat introduced an ability that can already be done via the normal rules. (Example: Pre-errata Prone Shooter.)
Here is the quote in the magic item creation rules which allows other people to provide the pre-requisites.
Note that all items have prerequisites in their descriptions. These prerequisites must be met for the item to be created. Most of the time, they take the form of spells that must be known by the item’s creator (although access through another magic item or spellcaster is allowed). The DC to create a magic item increases by +5 for each prerequisite the caster does not meet. The only exception to this is the requisite item creation feat, which is mandatory. In addition, you cannot create potions, spell-trigger, or spell-completion magic items without meeting their spell prerequisites.
Summary: Yes, Cooperative Crafting's big benefit is to shorten the time of magic item creation.

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Yes, the Wizard can provide the feat (Scribe Scroll) and the Cleric provide the spell. The feat Cooperative Crafting is not required.
Not in this case. A Wizard or any other character crafting a scroll with scribe scroll MUST know the spell in question. This is not a by-passable requirement. Same thing goes for potions and wands.

Gauss |
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LazarX,
The prerequisite cannot be bypassed by adding +5. Using another source of the spell is not bypassing the prerequisite. It is supplying the prerequisite.
From the quote I quoted earlier:
Note that all items have prerequisites in their descriptions. These prerequisites must be met for the item to be created.
States that the prerequisites must be met.
Most of the time, they take the form of spells that must be known by the item’s creator (although access through another magic item or spellcaster is allowed).
States that the creator must know the spells and then provides an exception where a magic item or other spellcaster can provide it.
The DC to create a magic item increases by +5 for each prerequisite the caster does not meet. The only exception to this is the requisite item creation feat, which is mandatory. In addition, you cannot create potions, spell-trigger, or spell-completion magic items without meeting their spell prerequisites.
States that you can bypass prerequisites by adding +5 to the DC except in the case of the item creation feat and spells in the case of potions, spell-trigger, and spell-completion items.
Since the cleric is supplying the spell as per the rule in quote #2 then quote #3 is not even an issue. Quote #2 allows the cleric to supply the spell to the wizard for a scroll.

Devilkiller |

I'm not sure if it was an "official" answer, but I believe SKR once posted:
A wizard and a cleric cooperating to craft a scroll of cure light wounds are, between the two of them, meeting all of the prerequisites for the item's creation. Thus, the "you cannot create this if you don't meet all the prerequisites" rule on page 549 does not apply, because "you" in the case of cooperative crafting is "the people involved in crafting the item."
Shortening the crafting time via Cooperative Crafting is a really good benefit since crafting time is the primary control on crafting in many campaigns.

MeanMutton |

I think a reasonable reading could go either way. Does "In addition, you cannot create potions, spell-trigger, or spell-completion magic items without meeting their spell prerequisites." apply only to the immediately preceding sentence or to the entire paragraph? Does the clause about access via another spellcaster only apply to magic items that are not portions, spell-trigger, and spell-completion?
The quote from SKR might be official, might not.

Gauss |

MeanMutton, if you use a magic item or another spellcaster to supply the spell prerequisite then you are meeting the spell prerequisite as stated earlier in the same paragraph on CRB p549.
Here is that quote again:
These prerequisites must be met for the item to be created. Most of the time, they take the form of spells that must be known by the item’s creator (although access through another magic item or spellcaster is allowed).
This is not in any way bypassing the prerequisite. It is supplying it.