Sunset Dragons are closely related to sunrise dragons. However, their behaviors differ greatly. Sunset Dragons generally live alone or in small packs. They are more active in the evening, hunting and performing all of their daily tasks as the sun sets.

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.

Letta Oasis is the daughter of Uzarah Malflame and Emphemeral Oasis. When she was a hatchling, Letta's parents were happy and still in love. But when her mother laid her second egg, even young Letta noticed a change. Uzarah seemed to believe that Letta and the egg would not be as good as a pure bred Sunset or Sunrise dragon would be. Her mother started to reject her, and Letta was the one who cared for the egg with her father.

Soon after the egg hatched into Letta's younger brother, their father left to try and find a gift to pacify their mother. Letta raised her brother almost on her own. She was devastated when her mother chose another male over her father, and she has never had a good relationship with her ever since.

Letta and her brother, Prishon, still have a close bond, and it was Prishon who set Letta up with her mate Masato, whom Prishon was mentoring at the time.