First mention of the hexade by Eric in a story comment. [1]

On that part of the Duane (the planet where Mount Elok’ram is), time is divided in groups of six days or hexades, each being attributed to one of the Elder Gods: Ghört (Airs) Nærvel (Waters) Agnima (Flames) Selvaniel (Woods) Margilonia (Earths) and Lejüs (Forgotten). The names or the days are Ghordië, Narduë, Agduë, Seldië, Marduë, Shandië.