| Spoiler warning!|
This article contains plot details from the latest books.
Tiergan, also known as Granite, is a Telepath and Sophie's Mentor at Foxfire. Tiergan and Granite have the same letters. He does not like being called Sir Tiergan, preferring just Tiergan after the mindbreak of Prentice and his resignation from his position as an Emissary. Tiergan adopted Prentice's son Wylie Endal after Prentice was sent to Exile and Wylie's mother, Cyrah, faded away. He doesn't like the Vacker family but does help them when Alden's mind is broken. During Neverseen, Tiergan is revealed to be Granite, part of the Collective (leadership) of the Black Swan.
Tiergan has olive skin, pale blond hair, and dark blue eyes. While his face holds youth, something ancient shines in his eyes. He is described as tall and thin, but a couple inches shorter than Alden.
Telepathy- Tiergan is a very strong Telepath; the reason why he was appointed as a mentor for Sophie.
- WYLIE ENDAL (adoptive son)
Wylie was adopted by Tiergan after both of his parents were lost. Tiergan is shown to be very protective of Wylie.
- PRENTICE ENDAL (friend)
Prentice and Tiergan were very close—so close that Tiergan was first in line to adopt Wylie before Wylie's actual family. When Prentice's mind was broken, Tiergan was full of grief and blamed Alden for the incident— because Alden was the one who accused Prentice of rebellion.
- SOPHIE (prodigy)
Tiergan came back from retirement to Foxfire to teach Sophie. He respects her a lot and believes in her abilities, ideas and trusts her to make good decisions.
- ALDEN (disliked but eventually respect)
Tiergan has a lot of anger towards Alden, blaming him for the loss of Prentice. He seems to gain more respect for Alden, however, after he finds Sophie. He also is able to get past his own feelings to help the Vacker family with the grief of the loss of Alden when his mind is broken.
- THE COUNCIL (disliked)
Tiergan doesn't like the council because they allowed the mindbreak of Prentice.
In Neverseen it was revealed that Tiergan works on the Collective under the name Granite with Mr. Forkle and it was suggested that the two could be friends or relatively close seeing how the two are around one another more than their other fellow collectives.
- FITZ (prodigy)
"You're very kind. But we both know I can never match you." -Tiergan to Sophie, Exile