Dvalin, known as Stormterror and the Dragon of the East, is a legendary dragon in Genshin Impact's world of Teyvat. Once a noble and free-spirited being associated with wind and freedom, Dvalin became corrupted and now serves as a formidable weekly boss challenge located in Stormterror's Lair in Mondstadt. Players must reach level 30 or higher to face this aerial beast. Upon defeat, Dvalin drops valuable materials including Dvalin's Sigh, Dvalin's Plume, and Dvalin's Claw, which are essential for character talent ascension. The dragon is characterized by powerful wind-based attacks and the ability to fly, making it a challenging encounter that requires strategic team composition and understanding of its attack patterns.