9178aa5b__of_the_Dead___Darksiders_Wiki__How_to_Acquire
[Number] 04 [Location] The Cauldron [Requirements] None [How to Acquire] 
After defeating Gharn, Death will pull a giant lever, which raises the lid off the Cauldron and restores the Fire of the Fountain. Break some nearby clutter to find the page.
The Book of the Dead - Darksiders Wiki
How to Acquire