Power, despite being an abstract concept, can be bottled up and stored in items in fantasy universes. Middle-earth is no exception: Tolkien's masterfully crafted world of elves, dwarfs, men, hobbits, orcs, and other creatures all won't say no to power in any form (except maybe the hobbits, who only want to eat and drink). Needless to say, there are many powerful trinkets in Middle-earth.