Upon seeing that her new patient was an elf, Heidi felt a bit surprised.
She rarely treated elves as patients—not just she, as a psychotherapist, but also most other types of "doctors" generally did not deal with elves.
This was because the elves, as a race, possessed physical traits that were the envy of other races; not only were they long-lived, but they were also rarely ill. Most of the time, they were incredibly healthy and able to survive well under harsh conditions. Along with their robust physical health, their mental resilience was often quite strong—perhaps as an adaptation to their excessively long lifespans, elves had very stable mental states. Although they were not as "stone-hearted" as the Senkin People, they were significantly stronger than humans.