From the introduction: Welcome to the DnD Community Council's Netbook of Magical Treasures. This Netbook has been published as a community effort to increase the pool of magic items available to dungeon masters and player characters. This Netbook was designed in support of the D20 System environment. This work is considered an optional source of material usable only with the permission of your DM. Although the items listed strictly adhere to the rules in the core rulebooks for creation of magic items, they may not fit into all campaigns or the DM may simply want to stick to core material.