Faun Toria was born on planet Vulcan to her parents, T'lana and Sarin. Both were scientists on their homeworld and worked in genetic research, having strong ties to Earth and Starfleet through their studies. When Faun was only 3 years old, she left Vulcan with her parents on a mission aboard a Vulcan Vahklas heading to rendezvous with another vessel to exchange findings of a recent project. They would never meet, however.
Before the arrival of the other ship, a Romulan vessel dropped from warp and began a vicious attack on their ship. Upon boarding it and ransacking it for the research it contained they killed those present efficiently and left. Faun was the only survivor as she had been hidden away during the boarding by her mother.
When the Starfleet vessel finally did arrive to rendezvous, it found the remains of the Vahklas. The only lifeform onboard being a young Vulcan girl clinging under a console near her dead mother and the rest of the crew.
As the Captain of the Starfleet vessel had known both her parents for years, he knew to not return Faun to Vulcan and had promised should anything happen to them that Faun would not be allowed to return there with no family. Because of the sensitivies of her parents positions and research were not well received amongst those on their homeworld, he agreed returning her there would not be wise. Instead, she was taken to Earth to a couple who had been friends of her parents in the past years. They would raise her in a mostly human upbringing until she would be accepted to Starfleet herself at the age of sixteen.