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Campaign Systems / Magic Item Creation

Cooperative Crafting

Source Ultimate Campaign pg. 170
If you need another character to supply one of an item’s requirements (such as if you’re a wizard creating an item with a divine spell), both you and the other character must be present for the entire duration of the crafting process. If the GM is using the downtime system, both you and the other character must use downtime at the same time for this purpose. Only you make the skill check to complete the item—or, if there is a chance of creating a cursed item, the GM makes the check in secret.

If the second character is providing a spell effect, that character’s spell is expended for the day, just as if you were using one of your own spells for a requirement. If the second character is a hired NPC, you must pay for the NPC’s spellcasting service for each day of the item creation.