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Part 8 • Core p192 • book p.192
Magic Item Research
Any character who wishes to create magical items must know all (if any) spells to be imbued in the item. Items that produce effects not matching any known spell may require additional research (to devise the unknown spell) if the GM so desires.
Some magic items require one or more special components that cannot usually be bought. Special components can only be used once on such a project. For example, the GM might require the skin of a deceiver to create a Cloak of Deception, or mountain dragon saliva to create a Wand of Fireballs. Note that there are specific rules for components under Other Magic Items, below.
Special component requirements are entirely at the option of the Game Master, and are usually employed to slow the creation of powerful magic items that might tend to unbalance the campaign. It's also a way to lead the spellcaster (and their party) to new adventures.