Tsunami Wyverns are gigantic dragons that live near the ocean. These wyverns can create deadly tsunamis by vigorously flapping their wings directly above the water. They create these waves to catch the eye of potential mates or as a form of self defense, as they are hunted for their beautiful skin. A Tsunami Wyvern’s wings are also helpful in gliding over the ocean without expending much energy. Their colors make it easy for them to blend in with the ocean water, which can be useful while stalking prey. Using their rudder-like tails and webbed feet to dive deep into the water, they can easily catch and eat their fill of big fish. Tsunami Wyverns can be found mostly near island chains.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Unlike most Tsunami Wyverns, who only create tsunamis when mating or threatened, Bringer of a Thousand Deaths was vicious, if not totally mad. She is well-known for attacking coastal human settlements for no obvious reasons, and being responsible for over half million deaths, she is among the top of the global "Wanted Dragon" list, but all attempts to hunt her down simply resulted in a tsunami with record-breaking size in the hunters' face. Her attacks unintentionally attracted Tsunami Runner, a Coastal Waverunner who loves riding waves and also happened to be from the clan that she belongs to. While originally not friendly to the Waverunner, she was later pacified by the latter's cheerfulness and lowered her guards. Her random attacks also ceased, when she started to play with Tsunami Runner in the middle of the ocean by creating tsunamis for the latter to ride on.