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Deltarune Chapter 3 secret boss guide & how to defeat him

Mahaksh has been a part of Khel Now since 2024. He covers gaming-related news and updates.
Published at :June 8, 2025 at 2:38 PM
Modified at :June 8, 2025 at 2:38 PM
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(Courtesy : Toby Fox)

Hidden secret boss!

Fans and players might think that they have completed Deltarune Chapter 3 after defeating Tenna’s dazzling game show. But here’s the twist: a secret hidden boss is hiding with great loot.

In this article, check out the complete guide on how you can find this secret boss, defeat him and loot his great rewards in chapter 3.

How to unlock secret boss in Deltarune Chapter 3?

Players need to earn an S rank in Tenna’s game show to unlock a mysterious “S”-marked door. This is a secret passage that leads to a hidden area.

In this area, there are many powerful gears and tougher battles, setting the stage for the boss encounter.

Tips to prepare for battle

Here are some tips and key items that you need to prepare before you fight the secret boss:

  • Ice Key: Begin by playing the first minigame as Kris alone (without Susie or Ralsei). Defeat foes to advance Kris to level three, exposing a treasure containing the Ice Key.
  • Shelter Key: Advance to the second minigame, earn another S-rank, and discover a new secret zone. Battle foes to achieve Kris’s level 2 and discover the Shelter Key buried in the map.
  • Shadow Mantle: In the third minigame, get your final S-rank to obtain the Shadow Mantle. This critical armor is your only defense against the boss’s destructive blows; don’t enter without it!

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How to defeat the secret boss in Deltarune Chapter 3?

The secret boss is called ‘The Knight’ and is very difficult to fight in Deltarune Chapter 3. Here’s how you can easily defeat him:

  • Level Up Early: Grind levels in minigames to empower Kris and increase your chances of surviving the fight.
  • Stock Healing Items: Regardless of how well you dodge, expect to take hits. Stock up on recovery goods to get through the battle.
  • Master the Patterns: Spend time studying The Knight’s attack rhythms. Focus on avoidance and strike when opportunities arise; rushing in is a recipe for disaster.

With these tips and strategies, you will be able to conquer Deltarune Chapter 3’s secret boss easily. Do share your thoughts after completing the boss with us in the comments section.

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Mahaksh Chouhan
Mahaksh Chouhan

Mahaksh Chauhan is a passionate gaming journalist who loves for old-school RPGs and turn-based games. With a keen eye for storytelling and a deep understanding of game mechanics, Mahaksh brings an unique perspective to the world of gaming. Inspired by classics like Persona, Red Dead Redemption 2, and Skyrim, Mahaksh is dedicated in sharing the magic of games with readers. When not writing or gaming, Mahaksh can be found cheering on WWE superstars or watching his favourite Anime.

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