(In tales once foretold...) Dvalin, also known as Stormterror, is an Anemo elemental dragon and the original Dragon of the East of Mondstadt's Four Winds. He has been the Anemo Archon Barbatos' friend for almost 2000 years and is the longest-worshipped of the Four Winds.

However, during the cataclysm five hundred years ago, Dvalin was grievously injured in battle against the corrupted black dragon Durin and settled in the ancient god Decarabian's abandoned tower to recuperate. Over the course of five hundred years, the Abyssal poison in Durin's veins that Dvalin ingested continued to torment him, while the people of Mondstadt forgot him. When he finally awoke, Dvalin believed himself abandoned by the Anemo Archon and Mondstadt. The Abyss Order took advantage of this to corrupt his mind even further, inciting him to attack Mondstadt and earning the dragon the name "Stormterror."

Dvalin's sanity is eventually restored through the efforts of Barbatos' mortal form Venti, the Traveler, Paimon, Jean, and Diluc.

After Dvalin's purification, he renounced his title as Dragon of the East but has not abandoned his role as one of Mondstadt's guardians.

(Present day) Dvalin has been absent in the public view for quite some time, instead simply resting and doing his own thing in his lair. However, that's not to say that he's been avoiding humanity.

Sometimes, he would fly towards the skies and help the disguised god — Barbatos — on his little plans. Other times, a human comes to him, just like when that General Mahamatra visited him in his lair and took pictures.

Today, there's not much that Dvalin can do other than watch the city of Mondstadt from a distance or hunt for food. Even then, he had already ate. If only there would be someone to entertain him. "What a bore this day is becoming... Maybe I'll get lucky and have someone visit me. Hmph, it's unfair that Andrius gets weekly visits for a spar with the Traveler."

The anemo dragon rests his head, his eyes growing weary.