Karilon was a hidden isle in the Lonely Sea, south-west of the I.C.E. Age continent of Emer (Finnia). It was the headquarters of the Loremasters in the Shadow World timeline, and home of the only library surpassing that of Nomikos (Biblia). While it was not larger than Nomikos in the sheer number of volumes, its focus was deeper and so the world's greatest center of knowledge. The College of Karilon was where the Loremasters trained their initiates, whereas modernly (though arguably somewhat archaic itself) "Sages" of the Order of Lorekeepers use the Great University of Nantu.
It was the location where Bandur Etrevion was recognized for his work regarding the former servants of Kadaena. The isle was very guarded from the threat of outside assaults, with its precise location unknown and some magic involved in sailing to it. Karilon does not exist in the modern history, and appears on no map of Elanthia. It is only mentioned in archaic texts from GemStone III.
Behind the Scenes
In the modern history of Elanthia the Loremasters refer instead to the Illistim scholars who work instead from Library Aies. "Sages" were the original modernization of the Loremaster concept. However, the game lore has since evolved so that the Order of Lorekeepers existed in the Elven Empire of antiquity, but was probably related instead to the Chronicle keepers who helped found Ta'Illistim.