The Legatus Golem, also known as the Statue of Marble and Brass, is a formidable Field Boss introduced in Genshin Impact with the version 4.6 update. Here's a comprehensive guide based on the latest information.
Image via HoYoverse.
The Basics
•Location: You can find the Legatus Golem within Faded Castle in the Sea of Bygone Eras, located in the region of Remuria. After completing the world quest "Canticles of Harmony" on Petrichor Island, you unlock access to this boss.
Combat Mechanics
Phases
•Geo Shield Phase: The boss starts with a substantial Geo shield that must be broken. This requires either Geo characters or Claymore users.
•Main Combat Phase: Once the shield is down, the Legatus Golem transitions to direct combat, where it uses a mix of Pyro melee and ranged attacks.
Attacks
•Pyro Sword Slam: It infuses its sword with Pyro and slams it on the ground, creating a large AoE attack that players must dodge.
•Ranged Fire: Launches ranged Pyro attacks which can be avoided with good mobility or shields.
Weaknesses
•While it's primarily resistant to Geo, taking advantage of Elemental Reactions like Vaporize (Hydro + Pyro) or Melt (Pyro + Cryo) can significantly boost your damage output.
Strategy 
Team Composition
•Geo Users: Characters like Zhongli or Noelle are invaluable for breaking the Geo shield and providing shields for your team.
•DPS: Characters like Hu Tao for Pyro reactions or Ayato for Hydro application can exploit its elemental weaknesses.
•Supports: Characters like Xingqiu or Barbara can keep up Hydro application for reactions, while Gorou can buff Geo damage.
Tactics
•Shield Management: Focus on breaking the Geo shield quickly to move to the main combat phase.
•Dodging: The boss's attacks have clear telegraphing, allowing room for dodging, especially the Pyro sword slam.
•Elemental Reactions: Utilize elemental reactions not just for damage but to manage the battlefield by countering its Pyro attacks with Hydro or Cryo.
Rewards
•Defeating the Legatus Golem grants:
•Pulverized Nucleus (a new ascension material crucial for the upcoming Geo character, Arataki Itto's second rerun, or potentially new characters).
•Primogems
•Hero's Wit
•Mystic Enhancement Ore
Tips: 
•Shield Priority: Prioritize breaking the Geo shield quickly to avoid prolonged exposure to its Geo-based defenses.
•Mobility: Characters with high mobility or verticality like Venti or Xiao can avoid its ground-based AoE attacks more effectively.
•Interrupting Special Moves: Watch for moments where the Golem might use a special move or regenerate its shield; interrupting these can lead to significant damage phases.
•Team Coordination: Efficiently rotating through your team members to manage healing, shield breaking, and DPS can make the fight much smoother.
The Legatus Golem stands out with its imposing Geo shield and fiery melee, challenging players to adapt their strategies to break through its defenses and capitalize on its Pyro nature. This boss not only tests your combat prowess but also your ability to manage elemental reactions effectively.
