War on the Underworld

General Description
The war on the Underworld, which covers chapters 34 - 42 of Book 1 in the Black Crown series, details the events in which the Alliance — a combined might of the angels and fallen angels — wages war against the Underworld, led by the God-Slayer known as Van.

Summary
Knowing that devils are a species that endanger others, Van the White God-Slayer spent years ascending the ranks in the Realm of Fallen Angels, until he was in position to manipulate both them and Heaven.

After stealing the Secret of God, and blaming its capture on the Underworld, Van was able to convince the Realm of Fallen Angels and Heaven — the Alliance — to attack the Underworld out of fear, leading to ensuing chaos.

Multiple important characters died, most notably that of Summer Evans, Melanie Bernard and Chloe Murphy — two of which are witnessed, with the third described.

With Kristina, Lance and Rowan Chambers able to beat their way through the Alliance, they made it to the core of their base and managed to convince the angel Raphael to call off the war, explaining the trap that they had fallen into.

The angels from Heaven and the church retreat; however, Van orders that the fallen angels continue to fight, forcing Zane Euphoria, Rowan Chambers and Lagann to go after Van himself, entering his Rule of Three dome.

Following a close fight, the trio are able to claim victory after receiving the magic of all mages in the Underworld, combining it into a final attack that's able to overpower Van's Release of Justice spell, powered by the Secret of God.

Important Points

 * Black Crown loses two members: Melanie Bernard and Chloe Murphy
 * Zane's long-time friend, Summer Evans, loses her life
 * Black Crown gains one member: Lucy Hollis
 * Zane permanently becomes a devil
 * Zane gains access to Fire Devil-Slaying Magic

Trivia

 * Melanie and Chloe's death wasn't in the first draft of the story, only becoming an idea during the writing of the Seven Deadly Sins arc
 * Originally, Divinos was going to battle both Jay and Van
 * The reveal of Toki, Jack O' Hollow and Glacies was originally planned for the arc
 * When Amber reincarnates Lucy, Lagann makes a reference to the popular anime franchise Dragon Ball Z when he states, "Well, we don't exactly have a seven-set of orange wish orbs laying around, so I thought reincarnation was the only way," more specially referencing the dragon balls themselves
 * Van was originally not going to have a transformation, remaining in his base form the entire fight
 * In the first draft, Kristina had a small POV scene in Zane's battle against Jay
 * Alzon was only created during the writing of the very chapter before his introduction; however, the concept of the One Below had been planned from the start