Deltarune is a well-known adventure game, where you delve into a mystical realm and engage in thrilling combat sequences. With the recent update, Chapter 3 has been introduced, much like its predecessors, featuring a hidden boss lurking within.
In the third chapter of the game ‘Deltarune’, the hidden boss is known as the Roaring Knight. To triumph over this elusive adversary, you’ll need to secure a specific item and fulfill certain conditions. Beating the Roaring Knight can be quite challenging, but for those finding it tough, here’s a comprehensive guide on conquering the secret boss, the Roaring Knight, in Deltarune.
How To Find The Roaring Knight Secret Boss In Deltarune
To encounter the secret boss Roaring Knight, just keep playing until you complete Chapter 3. He’ll show up following the Teena boss battle. But be warned, he often defeats characters in just a few turns, so you’ll need a well-thought-out strategy to defeat him. Save your game after defeating the Teena boss and reload it once you acquire the Shadow Mantle. This will give you an advantage in preparing for the Roaring Knight battle.
To stand a decent chance against the hidden boss, the Roaring Knight, obtaining the Shadow Mantle armor is crucial. However, securing the Shadow Mantle can be quite challenging, but the effort put into getting it makes it all worthwhile.
How To Get The Shadow Mantle In Deltarune
Get S Rank In The First Board

Initially, your goal is to achieve an S Rank in the first board. Here’s a simpler way to reach that:
1. Start by working towards a T Rank by accumulating 1,500 points through persistent gameplay.
2. Once you have achieved the T Rank, focus on gathering all four keys and devote your attention to the cooking mini-game.
3. It might take several attempts, but eventually, you should be able to finish the board with an S Rank.

After that, make your way to the Green Room, where you can now enter the S Rank special room. In there, you’ll spot an NPC on the left side of the room who will allow you access to the backstage area. Navigate your way to the backstage, where a mini-game awaits. The objective in this mini-game is to search for the sword first and then employ it against the enemies. Gradually increase your level by gathering EXP through this process.
To progress, advance to level three so you can trim the cacti and move towards the right side. As you ascend slightly, you’ll gain the ability to fell trees. Continue felling trees and journey towards the forest until you find the Ice Key. Once found, grab the Ice Key as it is essential for obtaining the Shadow Mantle.
Get S Rank In The Second Board
Once you acquire the Ice key, the mini-game will conclude. Then, depart from the backstage and proceed towards the second stage. Just like the initial stage, an S Rank is required here as well. To achieve a total S Rank, you’ll need to gather all four photos on this stage, participate in the concert mini-game, and consume moss.
Play Mini-Games Again
Once you’ve completed your business with the Board, head back to the top-tier exclusive room and begin enjoying the console mini-game. This mini-game resembles the first one; you need to accumulate levels and advance by overcoming opponents.
In due course, you’ll come across a raft that requires you to navigate towards freezing waters in the north. Once you disembark, follow the trail leading into a temple. Inside this sanctuary, you’ll encounter numerous adversaries until you locate the White Cloak. With this cloak, your attacks will now unleash icy barrages on enemies that were previously resistant to such damage.
Get The Shelter Key

Keep going on your path until you come across a locked door. Use the Ice Key to unlock it, and you’ll step into a dimly lit area. In here, take notice of a shimmering item. Engage with it to obtain the Shelter Key.
After retrieving the Shelter Key, depart from the mini-game and return to the Green Room. There, you’ll gain access to the special room reserved for S Rank players, where you can complete the final level to obtain the Shadow Mantle.
As a gamer, I’ll embark on this mini-game alongside my comrades Susie and Ralsei. We’ll make our way beyond the city limits, venturing towards the manhole that lies ahead. Once we descend, we’ll continue our journey until we encounter Toriel, an NPC who will guide us to a hidden refuge known as the Shelter. With the Shelter Key I acquired earlier, I’ll unlock this safe haven and seek shelter within its walls.
Fight The Shadow Mantle Boss

Ultimately, you’ll find yourself venturing deeper into the shelter where you’ll come across a mini-boss known as the Shadow Mantle. This foe carries the Shadow Mantle item as its drop if defeated. During the fight, be cautious and prioritize dodging. Attack only when it’s safe to do so. If you emerge victorious, the Shadow Mantle will be yours. This valuable artifact will aid you in your quest to vanquish the Roaring Knight.
How To Beat The Roaring Knight Secret Boss In Deltarune

As a seasoned gamer, I’d recommend slapping that Shadow Mantle onto Susie here. She’s the one who’ll reap the biggest benefits from it. Now, let’s dive back into our game, firing up the old save to square off against Roaring Knight first.
Roaring Knight has five major attacks:
Attack | Effect |
---|---|
Ice Crystal Barrage | Lower damage, smaller hitboxes, and easy to dodge. |
Gaster Sword Blasters | Oneshots most of the time and requires very fast reaction time to dodge, which is almost impossible. |
Lemonbread Slash | A very fast attack that hits like a truck. It’s also hard to dodge. |
Swords’ Dance | Almost impossible to dodge. |
Slash | A low damage attack and the easiest one to dodge. |
You need to deal damage equivalent to 25 percent of the target’s HP to win the fight.
Best Equipment And Weapons For Your Team
Character | Equipment |
---|---|
Susie | Jevilstail, Shadow Mantle, Toxic Axe |
Kris | Saber10, Spikeband, Twin Ribbon |
Ralsei | Dealmaker, Twin Ribbon, Flex Scarf |
Rewards For Beating The Roaring Knight In Deltarune

By defeating the Roaring Knight, you’ll earn both the Black Shard and Shadow Crystal as rewards. If you successfully defeat the knight, Susie will dislodge a shard from its blade. Don’t forget to collect the shard when it falls, and you’ll receive the Shadow Crystal.
In the upcoming battles of Deltarune, The Black Shard proves to be an exceptional weapon for Kris. It’s particularly effective against enemies with a dark element, providing you with a significant edge.
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2025-06-05 18:44