The World Keys by Elbereth Gengwyn

This book tells the story of the legend of the creation of the World Keys. The author, Elbereth Gengwyn continually insists throughout the book that the power of these artifacts should never be used, and should be sealed away instead.

Summary
In the Age of Shadows, towns and cities were cut off from one another by Shadowbeasts, leaving it a dangerous task to leave town without the aid of the Fey. At some point, the Drow began to take control of these beasts, and use them for their own vile and dastardly plans.

The ancient hero Ogdar the Great was chosen by the Gnomes to defeat the Dark Elves. In order to do so, Ogdar travelled the world, convincing the Fey to assist in the World Key's construction. After the war, the World Key was shattered into six pieces, one for each element. Ogdar then distributed these keys to each species, ensuring that their power couldn't be gathered in one place again.

The Fey
It is said that the Fey are the beings who brought magic into this world. Back in the old days, they used to communicate directly with mortals, (specifically the Gnomes). Nowadays, most towns contain shrines to the Fey, and many religions exist which worship these deities.

The Water Key
Contains the Fey Aquafina. After the war, this key was given to the Elves of Kaerflyn. It was later used by the Elves of Malibrya to destroy the old Lizardfolk civilization via Tsunami. It was then sealed away by the Elves of Kaerflyn in the vaults of Kaerflyn.

The Earth Key
Contains the Fey Terrakott. After the war, the key was given to the Dwarves of Gierd. It was used to build the winding passages and awesome architecture of the city.

The Wind Key
Contains the Fey Galumor. After the war, the key was given to the Aarakocra of Tnok Town. Known used by Eliano the Aarakocra, the chief's daughter. Eventually, the key was stolen by pirates, where it passed hands before somehow ending up in Gallia.

The Spirit Key
Contains the Fey Spiritus. Nobody knows what happened to it after the war. Rumor is that Ogdar kept it for himself.

The Space Key
Contains the Fey Valumia. After the war, the key was given to the Lizardfolk of Malibrya. Elves got it after genociding the Lizardfolk. Known to be used to warp an entire fleet of navy ships into the Pirate Isles.

The Time Key
Contains the Fey Tempronos. After the war, the key was given to the humans of Dirox. A skirmish with the Elves of Kaerflyn ended up with this key being sealed in the Vault in Kaerflyn.