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They were all pests.
The Pest Control Troops in the border worlds were in charge of slaughtering these creatures, who were "errant" extraterrestrial humans from many worlds before.
So it turns out, it was the Spring of Eternal Youth, and it used to be an elf village, huh...
Yes, elves do exist. They are a type of intelligent bio-engineered humans created by humans, equipped with both brains and beauty, a perfect Longevity Species. Initially developed by the Earth Zero Government Army for colonization purposes and for use with remote prosthetic bodies, bioroids served as containers. They could cast "magic" with the help of nanorobots to prevent technology imitation by natives. If they went out of control, the military could lock their genetic lock, disable magic, or exterminate them with targeted gene viruses.
