Given to me by the Chief of the Deep Ones. He taught me his language and his runes. This is the ancient lore of his people which we shall follow from now until forever.
Since the rest of the book is in Daedric, are the Deep Ones Daedra? Since the text translated from Daedric is the same text as that of N'gasta! Kvata! Kvakis!, are the Deep Ones the Sload? Is it something else? The Sload sacrifice men at the Pillar of Thras. Perhaps the Deep Ones are who they sacrifice to?