Rules Overview: Crafting an Item
To start crafting a magic item, a character needs a formula for it, the required materials, and tools with which they have proficiency. The cost and time required depend on the item's rarity.
The Magic Ingredient
Creating a magic item requires more than just gold; it requires an exotic material from a creature. Finding this material should be part of the adventure. The DM determines exactly what item is needed, but the table above shows the suggested Challenge Rating (CR) of the creature the party must defeat.
Complications
For every 5 workweeks spent crafting, there is a 10% chance of a complication (e.g., rumors spread of your wealth, local thieves attempt to steal your materials, or the magic component reacts volatilely).