Deltarune is an engaging adventure game that allows you to engage in thrilling combat sequences and delve into a fascinating, enigmatic universe alongside your allies. The recently released Chapter 4 offers numerous puzzles and hidden gems for players to discover.
Similar to other chapters in Deltarune, there are hidden bosses in Chapter 4 as well, tucked away behind a series of puzzles. Here’s a comprehensive guide on how to uncover the secret boss known as the Hammer of Justice and defeat him in Deltarune Chapter 4:
1. Progress through the story until you reach the area with the two doors – one labeled “UP” and the other “DOWN.”
2. Choose the “DOWN” door, then head to the next screen and enter the house on the left side of the path.
3. Inside the house, interact with the TV and watch the video that plays. Afterward, go back outside.
4. On the path, you’ll find a small hole in the ground. Jump into it to reach a secret area containing a chest. Open the chest to obtain the Hammer of Justice key item.
5. Return to the area with the two doors and select the “UP” door this time.
6. In the next screen, go to the right side of the path and enter the house there. Inside, use the Hammer of Justice key item on the suspicious-looking floor tile to reveal a hidden passageway.
7. Follow the passageway until you reach a large room with a new character named Ralsei. Speak with him to initiate a battle against the Hammer of Justice boss.
8. Defeat the boss using the strategies and abilities available in Deltarune’s combat system. Good luck!
How To Find Hammer Of Justice Secret Boss
Just like other hidden bosses, you’ll encounter the Hammer of Justice Secret Boss once you’ve solved the Golden Piano enigma. To solve this puzzle, gather three pieces of music and play them on the piano in the correct order. If you manage to play the entire melody correctly, the Hammer of Justice Secret Boss will appear. So here’s a step-by-step guide:
1. Locate the three pieces of music scattered around the area.
2. Gather all three sheets of music and bring them to the Golden Piano.
3. Place each piece of music on the piano in the correct order.
4. Press the keys according to the notes on the music sheets to play the entire melody.
5. Once you’ve played the whole song correctly, the Hammer of Justice Secret Boss will appear!
Get The Ability To Climb

Prior to starting any tasks, acquire the skill to climb first. Proceed through the story as usual, and eventually you’ll face the Jackenstein boss. To obtain the Claimb Claws (the item that grants climbing ability), you must defeat him. Now, with your newfound climbing skills, you can revisit the Study Room by scaling your way there. Upon arrival, you’ll need to travel to three distinct places to retrieve three pieces of music.
Music Sheet 1 Location
The initial piece of music is located in the room that features a waterfall and a donation box. If you can access it by going behind the waterfall, please do so. However, if you’ve already completed the sanctuary, remember to revert to an earlier save point to retrieve this music sheet.
Music Sheet 2 Location
To locate the second music sheet, proceed towards the region at the top-left corner that bears the sign “Jockington grows a beard.” Once you reach this spot, you’ll discover a wall suitable for climbing. Ascend the wall, and you’ll uncover the hidden second music sheet tucked away there.
Music Sheet 3 Location
You should head back from the Tea Room and keep walking until you spot a side path. Once you’re on that path, continue going to retrieve the third music sheet that is located nearby.
Go To The Golden Piano

Once you’ve gathered all your sheet music, return to the Golden Piano and perform the entire piece. Following the performance, navigate through the door bearing the Hammer symbol in the Study Room to find the Magic Axe.
Fight The Hammer Of Justice Boss

Engaging with the enchanted axe brings forth an elderly figure. A conversation ensues, where the old man explains that the Mystic Axe is not a gratis item and requires payment. Upon examining the price tag, it becomes clear that purchasing the axe isn’t an option. However, he offers to gift the axe if you manage to triumph in his challenge.
Should you choose to take up the task at hand, the elderly figure will metamorphose into the enigmatic Secret Boss known as the Hammer of Justice. To triumph in this battle, you’ll find yourself relying heavily on Susie, and primarily utilizing your Rude Buster for victory.
How To Beat Hammer Of Justice Secret Boss

Every time you activate Rude Buster on Susie, a mini-game involving the Hammer of Justice begins. To retaliate, you’ll need to defend against incoming arrows with your axe, and as the game progresses, your attacks will grow stronger. Additionally, you’ll have to dodge or block falling hammers using your axe too.
Should any of the attacks find their mark on the heart located within the confines, you’re in for some significant harm. Consequently, it’s crucial that you evade his assaults while inside the box during the minigame. Moreover, the Hammer of Justice is equipped to counter your Rude Buster, and you must time your parry precisely to return the favor. Persist with the parries, and eventually, the boss will miss its strike, allowing you to inflict damage on the Hammer of Justice.
Reward For Beating Hammer Of Justice Secret Boss

If you manage to defeat the hidden boss, Hammer of Justice, he grants you both the Justice Axe and the Shadow Crystal as rewards. In essence, he tells you that he would have given them to you regardless of whether you won or lost.
If you can’t defeat the Hammer of Justice alongside Susie, she’ll decline the rewards and request another round instead. Consequently, it’s only possible to acquire the Justice Axe and the Shadow Crystal once you emerge victorious in the battle.
Following their battle, there’ll be a chat between the elderly gentleman and Susie. He’ll recount an old tale about the Master of the Hammer. Susie might wonder why the old man has been so helpful towards her. The old man will explain that Susie reminds him of the Dragon from the story. Subsequently, the scene fades out, and you’ll discover those items in your Possessions.
Read More
- Best Awakened Hollyberry Build In Cookie Run Kingdom
- Nintendo Offers Higher Margins to Japanese Retailers in Switch 2 Push
- Tainted Grail the Fall of Avalon: Should You Turn in Vidar?
- Nintendo Switch 2 Confirms Important Child Safety Feature
- Nintendo May Be Struggling to Meet Switch 2 Demand in Japan
- Top 8 UFC 5 Perks Every Fighter Should Use
- Nintendo Dismisses Report On Switch 2 Retailer Profit Margins
- Best Mage Skills in Tainted Grail: The Fall of Avalon
- Nvidia Reports Record Q1 Revenue
- Switch 2 Sales Soar to Historic Levels
2025-06-07 06:04