Underground Castle 4 Book Repository Strategy Underground Castle 4 Book Repository Introduction

There are numerous maps in Dungeon and Castle 4, most of which require exploration. This guide for the Book Repository in Dungeon and Castle 4 will help you explore the entire area more easily and quickly. In fact, the "Book Repository" is the core scene of Chapter 9, "Divine Realm," both a crucial area for exploring ancient books and a key battlefield for challenging the ultimate BOSS, "Nana." Below, we provide a detailed explanation to help you achieve your goals swiftly.

1. Core Content

The nine mysterious books scattered throughout the map contain special enhancement effects. Collecting them can unlock advanced storylines and resources. The first book is hidden behind an ancient tree in the lower right corner; click on the trunk to obtain it. There's also the Shadow Tower book, located on a hidden path in the lower right corner of the Elemental Road, with a critical book inside the tower's chest.

To find other books, you need to carefully investigate special building signs, rune marks, or terrain clues. You will also encounter the ultimate BOSS, Nana, a powerful leader guarding the Book Repository, who has high damage and special skills (such as stabilization mechanism, second-stage transformation ultimate). A reasonable strategy is needed to deal with her.

2. Battle Strategy

When encountering the boss, it's essential to prepare in advance to complete the challenge successfully. For the front line, Fiona is recommended, prioritizing stacking magic resistance; for the healer, use the Dawn Cleric to increase magic and attack attributes, with the fourth-level talent enhancing the healing effect on Fiona; for support, Helena can be used to break the opponent's stability and disarm them.

For the main DPS position, it's recommended to use Woodland Ranger, Mora, or Rena, with Mora advised to take the energy reduction talent. As for the battle process, at the beginning, use Helena to break the stability, Fiona's ultimate to break defense again, and Rapid Arrow to disarm Nana for 5 seconds. Use Hammer of Judgment to stun Nana for 5 seconds before the disarm ends, and bless the main DPS. When Nana releases her second ultimate, promptly give Fiona a shield rune, and then slowly wear down her health.

With this guide to the Book Repository in Dungeon and Castle 4, you can successfully defeat Nana and collect all the books. This unlocks subsequent storylines and advanced resources, advancing the main plot. However, some books require deciphering special symbols or terrains, such as the Mirror Tower entrance, so keep a close eye out.