Written by Aarav Agarwal

Browse all DLETARUNE If you want the Shadow Mantle in Deltarune Chapter 3, you’ll need to S-rank both of Tenna’s minigame boards and unlock the hidden version of each.

This leads to a secret room, several unusual dungeon variations, and eventually, a formidable boss. Defeating that boss grants you the Shadow Mantle... and sets you up for Chapter 3’s true final encounter.

Step 1: S Rank Both Boards

You must get S Rank on both minigame boards (the ones connected to Tenna’s TV games). You’ll know you’ve achieved it when the green room unlocks the “S-Rank Door.”

To enhance your rank:

• Episode 1: Gather all 4 keys (not just 3)
• Episode 2: Collect 4 photos (including Lancer at the geyser) and locate moss patches

Some players talk about a bribe option to bypass this, but it doesn’t always work.

Step 2: Enter the S-Rank Door

After earning S-rank, go to the S-Rank Changing Room (the green room with the large door). Each time you enter after playing a board, you’ll unlock a new variant dungeon. You’ll need to complete 3 distinct game variants to obtain the Shadow Mantle.

Each one is somewhat altered and more challenging than the originals.

Step 3: Finish All 3 Minigames

• Game 1: Traverse, level up, then break through trees in the upper-right forest area to discover a chest containing the Ice Key.
• Game 2: Utilize the Ice Key in the snowy area accessed by raft. You’ll encounter an NPC who follows and assists you. Use their ice blasts to freeze enemies into movable blocks for puzzles. Eventually, you’ll gain another key.
• Game 3: Go into the last S-rank minigame. Explore until you reach the boss battle. You can even strike in-game Susie and Ralsei (it’s unclear if this impacts the story).

Step 4: Conquer the Boss

The boss is quick, and full of tricks.

Tips:

• Concentrate on evading during the orange orb attack
• When the boss launches bombs, you can switch to offensive
• Minions drop healing items, so eliminate them early
• In the final stage, dodge meteors and target the black version of the boss, not red

Winning the fight rewards you with the Shadow Mantle, a protective item that lessens damage and prepares you for the next secret.

Step 5: Defeat the Roaring Knight (Optional Secret Boss Fight)

If you have the Shadow Mantle equipped when you encounter the Roaring Knight (after Tenna), you can activate a hidden final boss phase. The Knight yields a Shadow Crystal and a Black Shard, a weapon for Kris.

Without the Shadow Mantle, the fight would be extremely difficult. With it... still tough, but manageable.

Final Summary

Securing the Shadow Mantle involves completing some of the most challenging parts of Chapter 3, and unlocking this chapter’s secret boss.

FAQ

Q: Can you get the Shadow Mantle without S ranks?

No, S ranks on both Tenna boards are essential to access the S-Rank door.

Q: Do I need to defeat the boss in one attempt?

No, if you lose, Gaster will allow you to retry the boss fight.

Q: Is the Roaring Knight the secret boss?

Yes. It’s the closest Chapter 3 comes to an ultimate challenge once the Mantle is equipped.

Q: What does the Shadow Mantle actually do?

It minimizes damage in critical fights and might influence future chapter triggers or unlocks.

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