"a slight, restless, sharp-featured woman, with the family eyes [gold-flecked amber color] but a look of old Kermiac, too." (The Heritage of Hastur, page 172).
Lew Alton talk about "her strange wild beauty" (op. cit., page 237).
Extremely powerful. Lew Alton said that she was "stronger than most of us at Arilinn" (op. cit., page 238).
He said also "Thyra is a very strong telepath; she is an excellent technician and mechanic. But no Keeper." (op. cit., page 238).
Wild telepath (op. cit.).