The Emperor of Fire and Iron is a world boss found in an underwater cave in Fontaine for Genshin Impact 4.0. Check out how to get to the Emperor of Fire and Iron's location, how to beat it, its weakness, and its boss drops here!

Emperor of Fire and Iron Location

Located in the Belleau Region's Underwater Cave

The Emperor of Fire and Iron is found in the Belleau Region of Fontaine. You have to dive underwater to get to this boss' location.

Fontaine Underwater Map Guide

How to Get to the Emperor of Fire and Iron Entrance

Activate the Statue of Seven to Dive

Before heading to the boss location, activate the Statue of Seven in Fontaine to gain the Fontaine's Blessing, which will allow you to dive.

Underwater Combat and Exploration Guide

Head South of Elton Trench

After activating the Statue of Seven, the Boss Icon will appear on the map. You can get to that place by taking the boat on Romaritime Harbor or by using the teleport waypoint.

Enter the Underwater Tunnel and Follow the Path to the End

Dive beneath water and look for the large tunnel opening next to the Fontemer Aberrants. Simply enter and follow the tunnel path within until you reach the Emperor's lair.

Activate the Teleport Waypoint

Make sure you activate the teleport waypoint inside so you can quickly travel to the boss location. Beware of the boiling water in some parts of the cave that can lower your HP, similar to the Balethunder in Inazuma.

How to Beat the Emperor of Fire and Iron Boss

Take down the Pyro Shield from its Horns

The Emperor of Fire and Iron boss' weakpoints are its twin horns, imbued with Pyro energy. When the horns are closer to the ground, use Elemental Reactions, preferrably with Hydro, to destroy the shield and slow its attacks!

List of All Hydro Characters

Best Teams to Defeat the Emperor of Fire and Iron

Recommended Team Composition for the Giant Crab Boss

Ayato Vape Team
Ayato	Kokomi	Kazuha	Xiangling

Ayato is the best Hydro DPS against the Emperor of Fire and Iron! Kokomi and Kazuha can provide additional support in terms of destroying the enemy's Pyro shield. It's also best to pick characters you can spam attack with once the Emperor is stunned.

Bloom and Hyperbloom Team

Bloom Team
Nahida	Kokomi	Xingqiu	Baizhu
Hyperbloom Team
Alhaitham	Nahida	Xingqiu	Raiden

You can also use Bloom or Hyperbloom teams against the Emperor of Fire and Iron! Use Hydro and Electro to break its horns and proceed to deal maximum damage with Elemental Reactions.

Best Free-to-Play Team

Free to Play Team
Kaeya	Traveler (Hydro)	Lisa	Barbara

Best Characters by Role

Main DPS
Sub DPS
Support

Best Elements to Beat the Emperor of Fire and Iron

Recommended Elements

The Emperor of Fire and Iron is weak to Hydro the most, followed by Electro. You can also get rid of his Pyro shield by using Hydro and Electro to trigger Vaporize and Overloaded reactions!

Elemental Reactions Explained

Emperor of Fire and Iron Attack Patterns

Volcano Volley

The Emperor of Fire and Iron digs its feet into the ground and launches a volley of fireballs from the volcano-like cannon on its back. This attack deals Pyro DMG in a small AoE that can easily be avoided.

Lava Claw Attack

The Emperor of Fire and Iron will coat its larger claw with lava and strike the ground, causing lava to overflow in a straight line and dealing Pyro DMG to everything in its path.

Jump and Smash

The Emperor of Fire and Iron jumps into the air and crashes to the ground in a small AoE marked by a red circle on the ground just before it lands.

Lava Floor Attack

The Emperor burrows into the ground until only its top half and horns are visible. It will charge up and release a massive lava flow, dealing Pyro DMG to the entire arena!

You can avoid this by standing at the edges of the arena and wait for the ground to return to normal.

Emperor of Fire and Iron Item Drops

All Emperor of Fire and Iron Item Drops

Drop	Level
Agnidus Agate Gemstone	Lv. 75+
Agnidus Agate Chunk	Lv. 60+
Agnidus Agate Fragment	Lv. 40+
Agnidus Agate Sliver	Any Lv.
Emperor's Resolution	Lv. 30+

Emperor of Fire and Iron Artifact Drops

Artifact Set Drops
Adventurer	Berserker	Instructor
Gladiator's Finale	Wanderer's Troupe	Prayers for Illumination

Used to Ascend Lyney

Character	Element	Weapon
Lyney (5★)	Pyro	Bow
Gaming (4★)	Pyro	Claymore

You can use the Emperor of Fire and Iron's item drop to ascend Gaming and Lyney's character level! To reach the final ascension level, each character requires a total of 46 Emperor's Resolution.

New and Upcoming Playable Characters

Emperor of Fire and Iron Information

Version 4.0 Overworld Boss

A Mystical Beast in Fontaine

The Emperor of Fire and Iron is one of two new bosses revealed during the 4.0 livestream.

The Emperor of Fire and Iron is an armored crab and an ancient ruler of the other Fontemer Aberrants living in caves in Fontaine, marking it as the ultimate form of the sea creatures.

4.0 Livestream Summary

Emperor of Fire and Iron Released in Version 4.0

Genshin Impact Version 4.0
Release Date	August 16, 2023

Emperor of Fire and Iron was released on August 16, 2023 in Version 4.0, along with other contents!

Version 4.0 Release Date and Patch Notes

Genshin Impact Related Guides

All Boss Fight Guides

List of Bosses

Field Bosses

Geo Hypostasis	Anemo Hypostasis	Electro Hypostasis
Cryo Regisvine	Pyro Regisvine	Oceanid
Primo Geovishap	Cryo Hypostasis	Maguu Kenki
Perpetual Mechanical Array	Pyro Hypostasis	Hydro Hypostasis
Thunder Manifestation	Golden Wolflord	Bathysmal Vishap Herd
Ruin Serpent	Jadeplume Terrorshroom	Electro Regisvine
Aeonblight Drake	Algorithm of Semi-Intransient Matrix of Overseer Network	Dendro Hypostasis
Setekh Wenut	Iniquitous Baptist	Icewind Suite
Emperor of Fire and Iron	Experimental Field Generator	Millennial Pearl Seahorse
Hydro Tulpa	Solitary Suanni	Legatus Golem
Goldflame Qucusaur Tyrant	Gluttonous Yumkasaur Mountain King	Secret Source Automaton - Configuration Device
Tenebrous Papilla	Wayward Hermetic Spiritspeaker