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.

Feels Tsunami is one of the Cave's more eccentric—and annoying—dragons. Her favourite hobby is to fly up to a random dragon and ask them to imagine a scenario in which something bad happens to them, usually involving their mate being killed. Then, when she has successfully made them upset about something that hasn't even happened, she shouts, "FEELS TSUNAMI!" before flying away, leaving her unfortunate victim totally baffled. No one knows why she does this, or what 'feels tsunami' means. Tsunami seems to have a particular liking for targeting the members of 'fandom' cults like CAN'T FIGHT THE HOMESTUCK's; she takes great delight in twisting the stories that HOMESTUCK tells in order to kill off the characters and upset HOMESTUCK'S followers. Perhaps this rather cruel Tsunami Wyvern is just sadistic.