Her ring took her to the black hole that had been a star named 1417.196, which sucked her in as it had Whin. However, on her way back to Korugar, she was haunted by thoughts of Tarkus Whin, because the rites of death are sacred on Korugar. Although she allowed the ring to take her to the planet Oa, which served as the headquarters of the Guardians, she soon left, refusing to be inducted. Natu was horrified at the appearance of the ring, and rejected it, but when her patient's condition immediately began to worsen before her, Natu, desperate to save him, took the ring, and used it to conjure an elaborate medical apparatus that saved him, though her comrades in the operating room felt that by accepting the ring, she had damned herself. Natu in the middle of delicate neurosurgery on her home planet, Korugar. When Tarkus Whin, the Green Lantern of space Sector 1417 (of which Korugar was also a part) was killed on his first day as a Lantern after Star 196 collapsed into a black hole, his ring sought out a replacement, and found Dr. After the Parallax entity was removed from Jordan, and Jordan was restored as a Green Lantern, the Guardians set about to repopulate the ranks of the Corps, searching for 7,200 new Green Lanterns. The ranks of the Guardians were eventually restored by Jordan's replacement, Kyle Rayner.

The Corps suffered devastation when the demonic parasitic entity known as Parallax took control of Hal Jordan, turning him into a psychotic mass-murderer, and killing almost all the other members of the Corps, and all of the Guardians save their leader, Ganthet. Rather, Tui was seen as a monster by her own people for allying herself with them, even after she eventually gave her life in the line of duty, and is known among the Korugarans as 'The Lost.' When another Korugaran, Katma Tui, subsequently became a Green Lantern, this did nothing to restore the Green Lanterns' image. Although Sinestro's crimes were eventually exposed to the Guardians by Earth's Green Lantern Hal Jordan, and he was imprisoned as a result, the Green Lantern power ring and logo became to the Korugarans what the Nazi swastika was to the people of Earth.

As a result, he was known among Korugarans as 'The Wicked'. Sinestro, unbeknownst to his superiors, the Guardians of the Universe, who recruit and administrate the Green Lantern Corps, used his power ring to enslave his people and rule over them as a dictator. A neurosurgeon by trade, Soranik Natu, like the rest of her race, saw the Green Lanterns and everything associated with them as a symbol of oppression, because the first Korugaran to have been a Green Lantern was the renegade Sinestro.

Sinestro yellow lantern