Gunth Mach was the One Daughter of the Acyl nest of K'Chain Che'Malle, meaning that she was bred to ultimately become a Matron. Her mother was Gunth'an Acyl. She was first encountered in the company of Redmask and Sag'Churok. Later she was among the K'Chain Che'Malle guarding Kalyth.
She was capable of transforming her body to accommodate a rider.
She and Sag'Churok accompanied Redmask as guardians. During the final battle against the Letherii, Sag'Churok and Gunth Mach turned on Redmask and killed him, presumably for putting the interests of the Awl above those of the K'Chain Che'Malle.
She was sent by her mother to search the world of humans for some way to allow her species to survive. She found Kalyth as Destriant, Stormy as Shield Anvil, and Gesler as Mortal Sword. The humans led the K'Chain Che'Malle in a victorious battle against the K'Chain Nah'ruk.
In the aftermath of the battle with the K'Chain Nah'ruk, Gunth'an Acyl had sacrificed herself, leaving Gunth Mach, now Gunt Wanderer, in charge of Acyl nest.