Lydek Terisonen (Av."Nightsign slender Everwater"; PQ."Loitekeo Teresônen") was a member of the College of Loremasters in the Second Age.He was said to have fallen to insanity and vanished from the world but he had left a considerable amount of spurious lore, including tales about the Lords of Essence and the Althan and accounts on some of the Wild Lands East and South including Mur Fostisyr.