Think Chapter 3 of Deltarune is over once you’ve cleared Tenna’s flashy game show? Think again. There’s a hidden challenge lurking in the shadows—a secret boss fight that ups the difficulty and rewards in all the best ways. Here’s your all-in-one walkthrough to uncovering and beating this elusive threat.
How to Face the Secret Boss in Chapter 3?
Before you get to the boss, you’ll need to ace Tenna’s game show. Like, actually ace it—achieving an S-rank is the key. Once you’ve proven your skills, you’ll gain access to a mysterious door marked with an “S.” That’s your entrance to a secret area packed with powerful gear and tougher fights.
Gear Up: Essential Items You’ll Need
Taking on the secret boss unprepared is a fast ticket to a Game Over screen. Here’s the breakdown of what you’ll need and how to get it:
Ice Key Location: In the very first minigame, you’ll play as Kris—solo. No Susie, no Ralsei.
Focus on defeating enemies to raise Kris’s level to 3. When that’s done, a chest containing the Ice Key becomes accessible.
Shelter Key Details: The second minigame challenge is your next step. Score another S-rank, and you’ll unlock another version of the secret area.
Here, fight through enemies to get Kris to level 2, and you’ll be able to find the Shelter Key tucked away in the map.
Unlocking the Shadow Mantle: Once you’ve got both keys, head into the third minigame. It’s your last S-rank challenge—complete it, and you’ll finally earn the Shadow Mantle.
This isn’t just another armor piece. The Shadow Mantle is the only thing standing between you and a one-shot KO from the boss. Don’t go in without it.
Battle Tips: How to Beat The Knight
The Knight doesn’t play fair. Here’s how to stay alive and deal damage:
- Grind Levels Early – Use the minigames to level up Kris. Higher levels mean better survivability during the boss battle.
- Pack Your Bag with Healing – You’re going to take hits, even if you’re good at dodging. Stock up on recovery items to last through the fight.
- Practice Makes Perfect – The Knight’s patterns can be read with time. Learn the timing of its attacks and focus on avoiding rather than rushing in.
Worth the Struggle
Defeating The Knight won’t just give you bragging rights. You’ll unlock gear that can carry over to future content (and maybe hint at deeper lore, if you’re the theory-crafting type). Plus, it’s just a satisfying capstone to an already wild chapter.
