From Beyond

Beyond the gate of Agut-atoth are demons beyond number, hungered to madness they tear eternally at the barrier. What the Elder Gods crafted the demons cannot rend asunder but the sorcerer may open the gate for a short time and call through certain things by means of the proper seal and incantations. It is done with utmost care for if the H'klim of the Elder Gods take notice they will slay the sorcerer and should the sorcerer err in the seal or formulae he will surely be consumed by what is called up.
(The Druuna-Cosan Scrolls as translated from the Aklo by Prof. Ben Crawford)

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