Dragonblood Items

Crafters that have the dragonblood subtype often create magic items that are sensitive to the user's nature. Such items are "keyed" to the wielder's draconic heritage and must be held or touched in a specified way by the prospective user. Sometimes the item's manufacture reflects this: A sword's grip might have indentations for fingers or claws, an amulet could have a small spike to prick the wearer's skin, and so forth. Two types of dragonblood items exist - those with restricted use and those with hidden potential. Neither of these added sensitivities has an impact on the price of an item or its cost to create. It is up to the crafter to decide whether one of these traits is appropriate for the item in question.
Restricted Use Items: A crafter can make an item usable only by a creature with draconic ancestry. A user without the dragonblood subtype enjoys only the nonmagical qualities of the item: a masterwork suit of armor, a beautiful ring, and so forth. A wielder that has draconic blood can use the item in the normal way
Hidden Potential Items: A user that has the dragonblood subtype is able to activate a special ability worked into the item that is unavailable to others. For example, a +1 flaming longsword is instead a +1 flaming burst longsword in the hands of a dragonblooded wielder.