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Toby Fox’sDeltaruneis packed with hidden secrets, and Chapter 3 is no exception. While most players follow the main narrative path to the scripted conclusion, if you pay close attention and work through some of the challenges, you’re able to discover a hidden ending and a secret boss.
Unlike previous chapters where optional bosses were hidden behind strange puzzles or alternate paths, Chapter 3’s secret ending is quite different. You’ll need to achieve S-ranks and complete minigames to become powerful enough to stand a chance at this fight. So, here’s a complete breakdown of how to uncover this ending inDeltarune.
How To Get Chapter 3 Secret Ending InDeltarune
To unlock the secret ending of Chapter 3, you need to achieveS-rank scores in all three roundsof Tenna’s game show. Each S-rank unlocks access to a hidden room in theGreen Room, where Kris can enter a special minigame. You can get these three key items from completing the minigames:
Without these items,especially the Shadow Mantle, you cannot survive or defeat the chapter’s secret boss.
The above challenges are very easy to miss andneed to be completed in a specific orderto unlock the ending. If you miss any, you will have to restart from the beginning.
Completing S-Rank Rooms
After earning an S-rank in Tenna’s first challenge, go to the top-right corner of the Green Room andenter the door labeled “S.”Inside, you’ll find an abandoned dressing room and a minigame station. Initially, you may’t play until you exit and discover anOdd Controlleron the floor outside. Pick it up, return, and interact with the game to begin.
If you fail to get an S-rank, you can pay1,500 pointsto aPoint Merchantlocated past the golden Tenna statue (south of the Green Room) to force an S-rank and gain access.
Getting The Ice Key
In the first minigame, you’ll controlKris alonewithout Susie or Ralsei. Your goal is to reachlevel 3by defeating enemies, but you’ll first need tofind a sword. Go south from the spawn point, then move towards the left and down multiple screens tofind it hidden in a pond near some fish.
After leveling up, head to the eastern edge of the map where you’ll find two cactus plants. At level 3, you can destroy them and slash through trees blocking your path. After several screens, you’ll reach atreasure chest containing the Ice Key.
Getting The Shelter Key
Next, earn an S-rank in thesecond Tenna roundand return to the minigame room. The map layout will now mimic round two of Tenna’s challenge. This time, reachinglevel 2is enough. Grab your sword from a cave along the river, defeat enemies, and destroy ferns blocking your way forward.
Ride a series ofrafts past waterfalls, using theIce Mage’s freezing powersto solve puzzles. In the snowy maze near the end, track your Ice Mage’s movement to identify the correct path. At the end lies a glowingShelter Key, essential for progressing further.
Getting The Shadow Mantle
Once both keys are obtained, complete the third round of Tenna’s challenge and gain access to thefinal versionof the minigame. With Susie and Ralsei by your side, you’ll enter the Shelter using the key.
Inside, a boss fight awaits. Defeat it to claim theShadow Mantle, a special armor that protects the wearer frominstant death attacks,an essential item for surviving what’s to come.
Make sure you have space in your armor inventory before you open the chest. If not, you won’t be able to collect the Shadow Mantle.
Fighting The Secret Boss
With the Shadow Mantle in hand, reload your save fromright after defeating Tennabut before facing the final scripted cutscene. Now, instead of losing to theRoaring Knight, you’ll trigger a special fight sequence where the battle becomes winnableif you’re wearing the Shadow Mantle.
You must survive the Knight’s brutal attacks and dealat least 25% of its total HPin damage. When successful, the fight ends early, leading to anon-standard endingand bonus rewards. Even pacifist players are required to attack once to complete this hidden route.
Who Is The Chapter 3 Secret Ending Boss
TheRoaring Knight,long foreshadowed inDeltarune,is finally confronted as the secret boss of Chapter 3. Normally, the encounter ends in a scripted defeat. But with the right gear and preparation, you can withstand the Knight’s power and fight back, briefly turning the tide. This moment is pivotal, and reveals key lore hints and a glimpse intofuture battles in the chapters to come.
Deltarune Chapter 3 Secret Ending Rewards
Defeating the Roaring Knight gives you two major rewards, which are as follows:
