This completely insane arcanistic text describes the process of human ascension into a higher form of existence. This form is different, but definitely physical, as the scripture dismisses non-corporealism.
Mysticism aside, the Grimoire provides detailed instructions on the process, which in its ultimate stage requires a machine called 'The Anvil of Souls'. Which, if the book is to be believed, is located in Hell itself. Yeah. Very useful.