"The Final Battle need not be one of swords and fire it must only be a war of will. The inexorable entropy of all things ranged against the bitter rage of life. Forever screaming into the darkness."

Wow this book was excellent and a PERFECT choice to transition between the series.

Mortarion has one of thee most interesting Primarch backgrounds, learning his history makes his actions make a lot more sense. 

Swallow sets the stage so well for the final conflict to come.