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Gla'aki is a fictional entity known as a Great Old One created by Ramsey Campbell.
Gla'iki was first featured in the story The Inhabitant of the Lake written by Campbell. Gla'aki lives in Severn Valley near Brichester, England.
It has a cult who wrote Revelations of Gla'aki where they recorded the thoughts of their master they managed to remember. There are only eleven known volumes of the text, nine of which were abridged into a single edition.