Magus Coeruleus
Explorer
In order for two characters to cooperate in the creation of a magic item, do both need to have the relevant item creation feat, or can one supply the feat and the other the spell (for instance). I assumed the latter at first but then realized that rules don't actually address the issue directly. One could interpret the cooperation rule as assuming both have the creation feat and that the sharing of prerequisities is helpful only when there are multiple prerequisites beyond the creation feat (i.e. spells, skill ranks, race, etc.) and neither collaborator has them all while the two collectively do. Opinions welcome and anything official especially appreciated.
• Prerequisites: Certain requirements must be met in order for a character to create a magic item. These include feats, spells, and miscellaneous requirements such as level, alignment, and race or kind. The prerequisites for creation of an item are given immediately following the item’s caster level.
A spell prerequisite may be provided by a character who has prepared the spell (or who knows the spell, in the case of a sorcerer or bard), or through the use of a spell completion or spell trigger magic item or a spell-like ability that produces the desired spell effect. For each day that passes in the creation process, the creator must expend one spell completion item or one charge from a spell trigger item if either of those objects is used to supply a prerequisite.
It is possible for more than one character to cooperate in the creation of an item, with each participant providing one or more of the prerequisites. In some cases, cooperation may even be necessary.
If two or more characters cooperate to create an item, they must agree among themselves who will be considered the creator for the purpose of determinations where the creator’s level must be known. The character designated as the creator pays the XP required to make the item.
Typically, a list of prerequisites includes one feat and one or more spells (or some other requirement in addition to the feat).
When two spells at the end of a list are separated by “or,” one of those spells is required in addition to every other spell mentioned prior to the last two.