TL;DR
- Start at Crone Tower’s scribe near alchemy table to initiate NPC search
- Find all three key NPCs: Bertha in kitchen, Regina in Crone/Maiden Towers, Hersh near stables
- Hersh requires a longsword – buy from smith or steal from Maiden Tower armory
- Book location: outside north gates, left along wall, behind first white tower with cow skull
- Complete quest rewards valuable knowledge for later game progression
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Kingdom Come: Deliverance 2 meticulously recreates Trosky castle with multiple layered quests throughout the area. While primary missions typically include clear navigation markers, the Opus Magnum side quest demands independent exploration and careful observation of your surroundings. This comprehensive guide provides detailed navigation assistance when you encounter obstacles during this intricate investigation mission.
For players seeking immediate access to the Lightbringer’s Secret without completing the full quest progression, detailed location instructions are available in the final section. However, following the complete narrative provides richer context and additional experience points.
Your pursuit of the enigmatic manuscript for miller Kreyzl inevitably leads to Trosky Castle, where the investigation truly intensifies. The initial objective involves locating the castle scribe positioned in the upper level of Crone Tower, adjacent to the alchemy workstation where he conducts his scholarly activities.

The investigation then redirects your focus toward locating Nikvard, specifically through three individuals possessing intimate knowledge of his whereabouts and activities:
- Cook Bertha primarily occupies the kitchen facilities within Crone Tower (ascend the staircase visible upon exiting Henry’s residence). She typically remains stationary during daytime hours, making her the most reliably located informant.
- Maid Regina operates predominantly within Crone Tower’s service areas, though her duties occasionally require movement to Maiden Tower. Her patrol route makes timing crucial for consistent interaction.
- Stableboy Hersh works in the exterior compound near the designated stable structures. If initially unseen, investigate behind the main stable building. He resides in the cottage across the roadway and is identifiable by his distinctive straw headwear, though his in-game designation appears as Hired hand Hersh.

Stableboy Hersh presents a specific requirement: he demands a longsword as compensation for information and remains inflexible regarding alternative offerings. Acquire the weapon either through purchase from the castle blacksmith or via discreet acquisition from the ground-level armory in Maiden Tower. Upon receiving the blade, Hersh provides critical intelligence that, when synthesized with accounts from Bertha and Regina, enables deduction of Nikvard’s last known location.
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For players struggling to locate Nikvard or the manuscript directly, follow these precise navigation instructions. Exit through the northern castle gates and immediately turn left, maintaining proximity to the exterior wall. Upon encountering the initial white stone tower structure, approach it directly. The Lightbringer’s Secret rests concealed within a shadowed recess behind this tower, marked by the presence of a bovine skull adjacent to the hiding place.


After obtaining the manuscript, return directly to Kreyzl to conclude the Opus Magnum assignment. The esoteric knowledge acquired upon mission completion possesses significant utility for subsequent gameplay progression. Additional strategic insights are available through the referenced resource below.
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Kaboom!
Time Optimization Approach: Allocate approximately 15-20 minutes for NPC interactions if following the intended quest path. The direct book retrieval method typically requires 5-7 minutes when bypassing narrative elements.
Critical Mistakes to Avoid: Don’t attempt to persuade Hersh with inferior weapons – he exclusively accepts longswords. Avoid searching during nighttime hours when NPC locations become less predictable. Ensure you’ve exhausted all dialogue options with each character before proceeding to the book location.
Advanced Navigation Tips: Use the castle’s distinctive architecture as reference points. The white tower mentioned is the first structure encountered after the north gate, not subsequent towers along the wall perimeter.
Stealth Considerations: When acquiring the longsword from Maiden Tower’s armory, employ crouch movement and monitor guard patrol patterns. The armory typically contains 2-3 additional valuable items worth collecting if employing this approach.
Action Checklist
- Locate scribe in Crone Tower upper level near alchemy station
- Find Cook Bertha in Crone Tower kitchen (daytime recommended)
- Locate Maid Regina in Crone Tower service areas
- Acquire longsword for Hersh (purchase or stealth acquisition)
- Retrieve Lightbringer’s Secret behind north gate white tower
- Return completed book to Kreyzl for quest resolution
No reproduction without permission:SeeYouSoon Game Club » Where to find Lightbringer’s Secret book for Kreyzl in Trosky castle. Location of Nikvard and Hersh in Opus Magnum mission guide Complete guide to finding Lightbringer's Secret book and key NPCs in Trosky Castle for Opus Magnum quest
