Chapter 3 Secret Boss [The Roaring Knight] Guide

This is a battle that was never meant to be won.

Core Task: Obtain the Shadow Mantle

Unlike the previous chapters, the secret boss fight in Chapter 3 isn't about simply finding and challenging them. You must first complete a long and hidden side quest to obtain the key item, the Shadow Mantle, to survive and win an otherwise unwinnable story battle.

The entire quest can be summarized as: entering a hidden development area called "_THE ROOM_" a total of three times at different stages of the chapter and completing the tasks within.

Shadow Mantle Acquisition Walkthrough

There are two ways to enter "_THE ROOM_": achieve an S-Rank in a minigame, or get the lowest Z-Rank. S-Rank is the most direct method.

1. First Visit: Find the Ice Key

   • Achieve an S-Rank in the first scoreboard minigame.
   • Enter the S-Rank room north of the Green Room and speak to the plug NPC on the left to enter "_THE ROOM_".
   • Inside the room, interact with the arcade machine to enter a beta minigame.
   • In the minigame, first go to the bottom right to find a sword, then level up by defeating all enemies. After leveling up, your sword can cut down cacti and trees.
   • Clear the map, cut down the cactus on the right side of the map, and continue clearing enemies to level up. Finally, in the northern area of the map, cut down trees to open a new path and find a chest containing the Ice Key.

2. Second Visit: Traverse the Maze

   • Continue the main story and achieve another S-Rank in the second scoreboard minigame.
   • Return to "_THE ROOM_" and enter the arcade machine again.
   • In the new minigame map, find the raft and sail to a small white island in the top-left corner.
   • Use the Ice Key you previously obtained to open the door on the island.
   • After entering, you'll meet a cloaked NPC. In the following maze, follow this NPC closely. If they stop and won't take a certain path with you, it's the wrong way. Follow them through the entire maze, and the quest will complete automatically.

3. Third Visit: Battle the Mantle Guardian

   • Continue the main story until you return to the Green Room again.
   • This is your last chance to enter "_THE ROOM_". Enter the arcade machine, and you'll find yourself in a new scene.
   • Follow the story (you'll see Toriel) and use the key you got earlier to open the "Sanctuary" door.
   • Before entering the sanctuary, make sure you have an empty slot in your inventory!
   • Once inside, you will face the Mantle Guardian Boss. The trick to this fight is to prioritize killing the smaller enemies it summons, as they drop healing items. When the boss's health is low, it will launch an un-dodgeable attack. You must attack it the moment it descends to interrupt it.
   • Upon defeating the guardian, you will receive the crucial Shadow Mantle.

Final Showdown: The Roaring Knight

After getting the Shadow Mantle, the most important thing is:

Equip the Shadow Mantle on Susie!

Then, proceed with the main story until you encounter the final boss, The Roaring Knight. In the normal story, this is an unwinnable battle. But now, with the Shadow Mantle, you will have a chance to rewrite the outcome.

Battle Strategy

• Must Attack: This fight can only be won by using FIGHT. Don't worry, this will not affect your pacifist route rating.
• TP Strategy: Have Kris and Ralsei Defend each turn to quickly build TP. Use all the TP to have Susie cast Rude Buster, which is the main source of damage.
• The Critical ACT: When the Knight's health is low, it will start to glow, preparing a finishing move. When it's Kris's turn, use a special ACT. This ACT deals no damage but provides a crucial speed boost, allowing you to potentially dodge the upcoming ultimate attack.
• The Final Blow: After successfully dodging the ultimate attack, hit the Knight with any attack to win the battle.
• Items: Bring plenty of ReviveMints. Getting knocked down in this fight can put your HP in the negative, and normal healing items may not be enough.

Rewards

After this miraculous victory, you will receive the chapter's secret rewards:

• Shadow Crystal
• Black Shard (a powerful weapon)