The Book of Sin, introduced during the Tutorial, is one of the most important aspects of the game involved with increasing the strength of your forces and your main character.
-The Book of Sin is upgraded with Wickidness, obtained primarily through PvP activities in the Arena and a couple of other sources
-The Book is a very heavy source of Skill Points for your main character to use. Currently the only other known source is through heavily upgraded Miracle equipment.
-Upgrading the Book is the only method of increasing the number of servitors you can use in your active combat formation, up to 7 alongside your main character to end up with an 8-member team.
-Upgrading the Book is the only method of obtaining new Gems of Resonance, a powerful item for your main character.
-Upgrading the Book is the primary source of servitor Contracts, with very few ever being found elsewhere.
-Upgrading the Book is the only method of obtaining new equipment Totems for upgrade.
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