In Dark Quetzal, Frazhin, now styling himself as a Starmaker, has enslaved many Half Creatures using the khiz who worship him as a god.
He successfully enters the Memory Trance but is stalled by the discovery that he was born in the Echorium to a Singer father and a Forest people mother, raised there until it was realized he was resistant to the Songs; at some point, he was made to forget his training and was sent away.
Although Frazhin's crystal-fused body resists the Yehn sung to him, he is then shot with a poisoned arrow by Night Plume, stabbed by Jilian, and finished off by angry Horselords and Karchholders.
In Song Quest, Kherron is a hot-headed novice who resents the restrictive life of The Echorium, although he still aspires to become a Singer.
Kherron accidentally betrays Rialle to Frazhin but then helps heal the Karchlord Azri and leads the rescue party, which leaves the Echorium.
He is shown to have maintained his friendship with Lazim and, to a lesser extent, with Frenn, and he comes to respect Renn's promise as a Singer.
He is deeply suspicious of Dark Plume when he first arrives and is very focused on his grudge against Frazhin, although he is distracted by the suggestion of a cure for his voice.
Rialle is introduced as a gifted novice who can hear the merlee, a close friend of Frenn and Chissar but envied by Kherron.
It is suggested she had a long relationship with Frenn, despite his status as an orderly, although she also slept with Kherron to fulfill her duty to The Echorium.
At the end of the book, he returns to orderly training partially healed by the Echorium Songs, although he still walks with a limp.
At the end of the book he joins forces with Shaiala to help defeat Frazhin and win her herdstone, reconciling their previous differences.
Before the beginning of the book she has her memories wiped by Yashra's crystal mask, and can only remember the night she was captured and the rest of the herd's foals enslaved.
When the Wavesong reaches the Mainland, she runs away and tries to find the centaurs but is kidnapped again by Yashra, who Shaiala remembers from her capture and immediately hates.
With Erihan's help, she escapes and finds the centaur herd, who give her the herdstones needed to free the captured foals.
In Crystal Mask, he travels to Rivermeet to try to find his missing mother, but is mistaken for a street child and captured by Lady Yashra's men.
In Dark Quetzal, he is married to Shaiala, and takes over leadership of the tribe when his father abdicates, leading the attack on Frazhin's temple.
In Crystal Mask, she is Frazhin's lover who assists him with building the Khizalace, enslaving centaurs and kidnapping street children.
In spite of this, Kyarra forms a close bond with her when they are both kidnapped, and her desire to cure her mother becomes a major motivating factor.
At the end of the book, she has been cured by the Forest People's potions, and has resolved to live a better life and care for her daughter, who has only just recovered from Yehn.
Although she initially refuses to believe that her parents are not Singers, Kyarra comes to care greatly for Yashra when they are both kidnapped on Frazhin's orders, and wishes to cure her.
Kyarra receives Yehn while in the Fane, and does not wake for five years, in which time Yashra is healed and resolves to care for her daughter.
Caell is Kyarra's close friend in the Echorium, who discovers he can talk to merlee and passes on the message from them that her mother is ill.
When this results in Kyarra's kidnapping and his own near-drowning by Frazhin's merlee, he feels very guilty for the pain he caused her, and she in return believes he is dead.
At the end of the novel, he is horrified when he must help sing Yehn to Kyarra in order to save her life, and is waiting on the mainland when she later recovers.
He is the leader of the flock of fledglings when he is brought to see Rialle, who uses her Songs to free his mind and ask him to fly to the Isle for help.
When sent to retrieve Kyarra and Yashra, Night Plume seizes his chance and reaches the Wavesong, where he makes contact with Caell.