Fa-Glin already lived on Dread Mountain when Kin still lived on Dread Mountain and kept a coat made from their skin. At some point before the Shadow Lord's takover of Deltora, an Ooze Toad named Gellick came to the Gnomes. He offered them his poison for their arrows in exchange for servitude. They agreed, but were unaware that Gellick's poison was also used by the Shadow Lord's Grey Guards.
Fa-Glin served under Gellick, acting like a bridge to keep the Gnomes compliant with the toad's wishes. Not because he was loyal, but because he did not want his people to be harmed. He was among the Gnomes that cornered Lief, Barda, Jasmine, and Prin in the caves where they bred giant flies for Gellick. He was as skeptical as the rest of the Gnomes that they could kill Gellick, but changed his mind when Jasmine—who had been shot by a poisoned arrow—was saved by the power of the Ruby.
He accompanied the companions into the treasure room where Gellick slept—along with Gla-Thon and Ri-Nan. This was done to make sure the companions did not steal any treasure. Ri-Nan betrayed the group by alerting Gellick and demanded that he should be made the new leader of the Dread Gnomes. Enraged, Gellick killed him, which allowed the others to hide. Fa-Glin witnessed Gellick's transformation by water from the Dreaming Spring and let Lief take the great Emerald in good faith. He also gave them a wooden arrow, telling them to return it should they ever need the aid of the Dread Gnomes.
Later, a swarm of Kin were reported flying towards Dread Mountain. The Gnomes readied for battle, but Jasmine reminded them that, without the Kin, the Boolong trees will continue to grow unchecked. Fa-Glin agreed, shed his Kinskin coat and went to greet the Kin as old friends returning home.
Fa-Glin sent Lief a coded message on the night of the Full Moon Meeting. It explained that, like the rest of Deltora, Dread Mountain was starving. However, he did not seek the king for aid like others did, as he is too proud and old to do so.