The idea for this product came about from my desire to have a mechanically sound way to measure the power, and thus rarity, of a magic item. Perusal of the existing items in the DMG can be a somewhat frustrating affair, as items will demonstrate different rarities even if they perform the exact same function.This product contains a system of guidelines for producing magic items that are balanced for a particular rarity.The system was created by breaking down the mechanical effects of magic items presented in the Dungeons & Dragons 5th edition Dungeon Master's Guide. The individual properties were classified into several categories, and then tested to see if items could be recreated from those categorized properties. Many items in the DMG can be recreated using these guidelines, but some items don't conform to the system, usually being rated at a lower rarity than their properties suggest.Despite some inconsistencies, I feel this is a useful tool for all Dungeon Masters who wish to create new and unique items without producing ones that are underpowered or overpowered.