The Invasion of Tiamat

At the end of the Fourth Age, Tiamat invaded Atlea with a huge number of chromatic dragons at her disposal. It truly was a test of humanity’s progress that they were able to stem her assault long enough for Bahamut to arrive (though most of the credit for that goes to a single wizard, Mordenkainen). Tiamat was forced to enter into a contract wherein her divinity as a Goddess would be removed if she invaded Atlea again. She retreated to her realm in the Astral Sea, now only having the power to enter the mortal realm briefly and only able to manipulate events on a small scale. Mordenkainen realised that the world was truly still unprotected, and established a Council of Sages to watch over as neutral magical protectors.

The Invasion of Tiamat

Atlea and Beyond Stackle