The Rite of the Draconian Oracle

 What it is 

The Oracle rite is pretty much the central rite of the DBoE system, in the same sense that the 0=0 is the foundation of the GD system- it's pretty much the foundation of the whole system, and most other rites are variants of it.

It has three primary uses:  Where to find it 
 * Rite of the Black Sun - This is the first big rite of the DBoE system. It acts in a similar way to the GD 5=6 and Liber Pyramidos of the A.'.A.'., or rather, the first part of each- this rite builds the temple and sacrifices the False Self (Abel), however it is not until the completion of HU that the initiation is sealed on the body of the candidate (the second step to this initiatory formula).
 * Rite of the Black Moon - This is a rite done on each new/dark moon at the home shrine.
 * Rite of the Black Earth - This rite prefaces the main rites of the year (HU, SA, BA etc.), acting as the rite of the first circle. To an extent, the main rites take the form of 'Oracle plus something else', showing how fundamental it is.

Because it's describing three rather different variations of the same rite, this area of the book is quite sprawling, and can lead to confusion easily. In it's entirety, the rite is discussed from pp77-126, however the section on the Hendecarch (the ritual theory of the Oracle rite, sort of like a Z-document for it) is technically also relevant; it's discussed from pp127-144.

To summarise- the entire body of teaching on the Dragon Oracle is on pp77-144 (inclusive).