The Stones of Tiamat

The Crafting of the Stones
For her crimes against her father Tiamat was to be locked up in Avernus, the first layer of the Nine Hells by the great Asmodeus, Lord of the Nine. However capturing her proved to be quite the difficulty due to her rare cunning and great strength.

The Lord of the Nine offered a contract, written in his blood after his faithful servant Bel failed to force Tiamat into her new cell. Asmodeus bargained with Tiamat, that if she entered her cell there would yet be a chance to escape it as long as the realm above (The Material Plane, Alemnia) had servants still worshipping her. Drawing a contract that he would not be able to break, if her servants freed her she would remain free until she died.

Tiamat agreed to the contract, knowing it would take a considerable amount of time for her to plot revenge on those that had doubted her. The cell door locked and Asmodeus took to the plane above to seek out Bahamut (Tiamat's Brother) and persuade him to hide the items that would unleash Tiamat from her prison.

Five Stones were crafted, each for a colour of her children and each would be the key to a lock on Tiamat's cell; White, Black, Red, Blue and Green. If they were ever brought together in one place and Tiamat's most loyal servants were sacrificed to them, she would be able to rise again. It was a thing that Bahamut swore never to let happen, no matter the cost, for her entrance to the world of Alemnia would mean the death of its citizens and her rule for eternity.

Bahamut tasked five of his servants to hide each stone in Alemnia and make sure that none were ever to be found again:

One was given to Mankind.

One was given to the Ocean.

One was given to the Angels.

One was hidden in the Great Desert.

The Last was kept with an Ancient Gold Dragon named Thorra, whom swore to keep it safe by hiding it in his bones.

The reason five Dragon Stones were created by Asmodeus is because he wanted a polar opposite to the Orbs of Dragonkind that had been used in the First Dragon Wars of Alemnia to lead dragons into traps and destroy them. He thought that there was a certain irony in this that only he and the dragons would understand.

During the Dragon Wars
The Dragon Wars were started when the five stones came together in Dhanab City, with the five Dragonlords of Alemnia being the sacrifice to their respective colour. Each stone of colour was destroyed when the sacrifice was made, apart from one.

It is still believed that the Black Stone is still intact somewhere within the realm of Alemnia, hidden with only a few aware of its existence. Jason Poole and Kiara of Falcon's Reach are the only two that still seem to possess any knowledge that the Black Stone is still intact.