The Mad Arab states the following in the Simon Necronomicon:
“Let all who read this book be warned thereby that the habitation of men are seen and surveyed by that Ancient Race of gods and demons from a time before time, and that they seek revenge for that forgotten battle that took place somewhere in the Cosmos and rent the Worlds in the days before the creation of Man, when the Elder Gods walked the Spaces, the race of MARDUK, as he is known to the Chaldeans, and of ENKI our MASTER, the Lord of Magicians.
Know, then, that I have trod all the Zones of the Gods, and also the places of the Azonei, and have descended unto the foul places of Death and Eternal Thirst, which may be reached through the Gate of GANZIR, which was built in UR, in the days before Babylon was.
Know, too, that I have spoken with all manner of spirit and daemon, whose names are no longer known in the societies of Man, or were never known. And the seals of some of these are writ herein; yet others I must take with me when I leave you. ANU have mercy on my soul!
I have seen the Unknown Lands, that no map has ever charted. I have lived in the deserts and the wastelands, and spoken with demons and the souls of slaughtered men, and of women who have dies in childbirth, victims of the she-fiend LAMMASHTA.
I have traveled beneath the Seas, in search of the Palace of Our Master, and found the stone of monuments of vanquished civilisations, and deciphered the writings of some of these; while still others remain mysteries to any man who lives. And these civilisations were destroyed because of the knowledge contained in this book.
I have traveled among the stars, and trembled before the Gods. I have, at last, found the formulae by which I passed the Gate ARZIR, and passed into the forbidden realms of the foul IGIGI.”
Warlock Asylum (The Dark Knight)