Master the Hammer of Justice boss fight in Deltarune Chapter 4 with expert strategies and secret locations
Introduction to the Hammer of Justice Challenge
Deltarune Chapter 4 introduces numerous demanding encounters, concealed secrets, and adrenaline-pumping combat scenarios, with the Hammer of Justice standing out as one of the most rewarding hidden boss battles. Overcoming this formidable opponent grants access to exceptional equipment including the Justice Axe and Shadow Crystal, both significantly enhancing your combat capabilities.
This optional encounter tests both your exploration skills and combat proficiency, requiring careful preparation and precise execution. The Hammer of Justice represents one of Chapter 4’s most challenging secret encounters, designed for players seeking to fully complete the game’s content.
Prerequisites and Preparation
Advance through the primary narrative until you confront the Jackenstein boss encounter. Vanquishing this opponent rewards you with Climb Claws, specialized gear enabling vertical surface traversal. After obtaining this essential tool, make your way back to the Study Room, the designated area for resolving the musical puzzle.
Pro Tip: Ensure your party is adequately leveled before attempting Jackenstein, as this mid-chapter boss can prove challenging for underprepared teams. Having healing items and upgraded armor will significantly improve your survival chances during this mandatory story progression segment.
Locating the Three Music Sheets
Successfully completing the piano sequence demands collecting all three musical manuscripts scattered throughout the game world. Each sheet requires careful exploration and utilization of your newly acquired climbing abilities.
- Music Sheet 1: Journey to the chamber containing the waterfall and contribution container. The document conceals itself behind the cascading water. Critical reminder: you must revert to an earlier save file if you’ve previously finished the Sanctuary area, as progression locks certain areas permanently.
- Music Sheet 2: Navigate to the dimly lit zone where the notification “Jockington grows a beard” displays. Scale the wall positioned in the upper-left section to discover the second manuscript.
- Music Sheet 3: Proceed adjacent to the Tea Room, then retreat backwards from the Study Room to uncover a concealed alternate route. Follow this path to secure the final sheet.
Common Mistake: Many players overlook the necessity of backtracking for Sheet 3, assuming all progression moves forward. The hidden path only reveals itself when approaching from the Study Room direction rather than the Tea Room entrance.
Activating the Secret Boss Fight
Once you’ve gathered all musical documents, return to the Golden Piano and employ the three sheets to perform the complete melody. Successful execution unlocks a concealed corridor. Descend this passage and locate a doorway marked with a hammer emblem. Within this chamber, you’ll discover the Magic Axe artifact.
Interacting with the Magic Axe initiates a cinematic sequence: an elderly gentleman materializes and proposes combat. Accepting his challenge triggers his transformation into the Hammer of Justice boss entity, commencing the demanding confrontation.
Strategic Note: Before touching the Magic Axe, ensure your party has full health and TP (Tension Points). The boss fight begins immediately after the cutscene, leaving no opportunity for last-minute preparations.
Combat Strategy and Battle Mechanics
When controlling Susie, activate Rude Buster to initiate a specialized minigame requiring precise arrow and descending hammer interception using your axe. Timing your defensive maneuvers is absolutely crucial, as errors result in substantial health depletion. The opponent will deflect your offensive actions, necessitating perfectly timed parries to successfully connect attacks.
As the engagement continues, his assault patterns accelerate significantly. Maintain concentration, preserve your offensive rhythm, and execute parries at optimal moments to gradually diminish his resilience and achieve victory.
Advanced Technique: The parrying mechanic follows a specific rhythm pattern. Watch for the white flash indicator on incoming attacks – this signals the exact moment to parry. Practice this timing in earlier battles to develop muscle memory before attempting this demanding encounter.
Optimization Tip: Equip Susie with gear that boosts her ACT (Action) speed, as this improves her responsiveness during the parrying sequences. The Mannequin accessory from earlier in Chapter 4 provides an excellent speed boost for this specific encounter.
Rewards and Post-Battle Content
Emerging victorious against the Hammer of Justice grants you the Justice Axe and Shadow Crystal equipment. A brief cinematic sequence follows where the elderly man recounts a narrative to Susie, drawing parallels between her and a mythological Dragon figure.
The Justice Axe provides superior attack power compared to Susie’s default weapon, while the Shadow Crystal offers unique defensive properties that synergize well with her aggressive playstyle. Both items remain relevant through subsequent chapters, making the effort to obtain them well worthwhile.
Also read: How many Deltarune chapters will there be?
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