Storm King's Thunder
The Elemental Crisis
In the year 1591, the Elemental Crisis occurred. A band of heroes from the Moon-sea, after thwarting the plans of the Cults of Elemental Evil there, were attacked by a group of assassins, which led them to Red Larch.
When they arrived, the party encountered more cultist, and defeating the cults one by one, until the end, when Yan-Ci-Bin was risen from the Elemental Plane of Air.
The party fought the prince of air, and eventually, were able to defeat him.
Name Here sacrificed herself to hold the air being in for one-thousand years.