Defeat Mueller: The Legend of Heroes: Trails in the Sky SC Guide

AntMag.NET

Quick summary

This section details how to defeat the optional boss Mueller in Chapter Four of The Legend of Heroes: Trails in the Sky SC. Winning provides only bragging rights, with no other tangible rewards. The fight is extremely difficult, especially on Nightmare difficulty, and requires significant preparation, including Joshua being at least level 76 (preferably 77 for a new S-Craft) and close to leveling up before the fight to restore HP/EP. Do not get the Bobcat Ignition Key until you are ready to face the Royal Army Soldiers preceding Mueller. The fight itself can take around 20 minutes and requires careful management of Joshua's crafts, arts, and items, with a focus on crafts that delay turns or buff defenses, and arts for healing and buffs. Avoid casting arts when Mueller is likely to use his arts-impeding attack.

Walkthrough

1
Preparation - Leveling: To prepare for the Mueller fight, Joshua needs to be at least level 76, with level 77 offering a slight stat boost and a new S-Craft. It is highly recommended to be close to leveling up (within 4 EXP) before engaging Mueller. This is because the preceding fight against Royal Army Soldiers (x4) grants 4 EXP, and leveling up will fully restore Joshua's HP and EP, allowing for aggressive art usage against the soldiers.
2
Preparation - Orbment Charging: Before proceeding to the Royal Army Soldier fight, locate the Bobcat. Instead of advancing the story, enter the Bobcat and go downstairs to find an orbment charging station. Use this to fully restore HP and EP.
3
Leveling Strategy: The most efficient leveling method involves repeatedly fighting two specific monster mobs: the Elder Owl and the Gold Rat. Backtrack between these two locations using the stairs as a transition point, as this ensures instant monster respawns. Use Fire Bolt EX for leveling. Return to the Bobcat to heal HP and EP when necessary.
4
Final Approach: Once Joshua is within 4 EXP of level 76 or 77, obtain the Bobcat Ignition Key. Do not fight any more monsters. Interact with the Bobcat, defeat the Royal Army Soldiers, level up, and then proceed to face Mueller.
5
The Fight: The fight against Mueller can last approximately 20 minutes. Joshua should be placed in the back row. Focus on damaging Mueller only after the initial 12 minutes, or when opportune. Manipulate turn order to your advantage. Utilize crafts like True Cloak & Dagger, which delay Joshua's turn less than other crafts. Use True Dual Strike when a STR50 or Crit bonus is active. Crit bonuses can also enhance healing arts and items. Conserve EP for essential arts: Clock Down, Clock Up EX, Sylphan Guard, and Teara. Avoid using arts like Blue Impact early on. Remember to use items as needed. Be extremely cautious of Mueller's attack that impedes arts and inflicts mute; if Joshua is in the middle of casting an art when Mueller gets a turn, he will use this attack, which can effectively end the fight.

Tips

Winning this fight yields no achievement, BP, or special item drop. The only reward is bragging rights.
Dialogue changes slightly upon winning or losing, with Josette saying one thing differently, but the core exchange between Joshua and Mueller remains unaltered.
Be aware that Mueller has an attack that impedes arts and inflicts mute 100% of the time. Do not cast arts if Mueller is likely to get a turn before Joshua, as this attack will be used.
Sylphan Guard is crucial for making Mueller miss attacks.
Do not get discouraged if Joshua misses attacks; this can happen.
Reference provided YouTube videos and Steam guides for visual strategies and detailed explanations.

100% Human-Written. AI Fact-Checked. Community Verified. Learn how AntMag verifies content

The Hardest Optional Boss (Spoilers!)