This is the battle walkthrough for the mission The Underground Chamber from Fire Emblem: Three Houses (FETH, FE3H). Read on to find out about map features, what enemies you will encounter, and tips for winning!

Previous Battle	Story Walkthrough	Next Battle
Chapter 5: Tower of Black Winds	Chapter 6: Rumors of a Reaper	Chapter 7: Battle of The Eagle and Lion

Chapter 6 - Map and Overview

Victory Conditions
Defeat the Death Knight or rout all other enemies.
Defeat Conditions
Byleth falls in battle or 25 turns have passed.
# of Player Units	8
# of Enemies	Normal: 26 + 3 Hard: 28 + 3

Chapter 6 - Enemies

Phase 1
Pos	Enemy	Pos	Enemy
A	Flame Emperor Soldier (Myrmidon)	B	Flame Emperor Soldier (Archer)
C	Flame Emperor Soldier (Soldier)	D	Flame Emperor Soldier (Cavalier)
E	Flame Emperor Soldier (Armored Knights)	F	Flame Emperor Soldier (Mage)
G	Flame Emperor Soldier (Dark Mage)	H	Death Knight

Phase 2
Pos	Enemy	Pos	Enemy
A	Flame Emperor Soldier (Cavalier)	B	Flame Emperor Soldier (Archer)

Death Knight - (Normal)

Level	20	HP	44	Movement	-
Class		Death Knight
Attack		Hit Rate		Critical Hit
35		124		43
Attack Speed	15	Protection	17	Resilience	18
Avoidance	25	Range		1
Weapon	Scythe of Sariel		Dropped Item	Dark Seal

Death Knight - (Hard)

Level	20	HP	46	Movement	-
Class		Death Knight
Attack		Hit Rate		Critical Hit
37		124		43
Attack Speed	17	Protection	19	Resilience	18
Avoidance	27	Range		1
Weapon	Scythe of Sariel		Dropped Item	Dark Seal

Chapter 6 - Chests

There are treasure chests that are placed in seemingly inaccessible parts of the area. These chests contain rare items which will be listed below.

Treasure Chest A: Contains a Levin Sword, a sword that has lightning properties.
Treasure Chest B: Contains a March Ring, a valuable accessory that increases the user's move by 1.

Chapter 6 - Map Features

Warp Points

There are warp points in the map that can be used to move your units to otherwise, inaccessible areas. Below are the points the warp gates will lead you to.

Levers

There are also levers in the map that triggers events which will be listed below.

Lever A: Activates all Warp Tiles.
Lever B: Deactivates the stat boosting tiles in the area.

Chapter 6 - Tips and Tricks

Two Routes

There are two routes available at the start of the battle. A seemingly narrow route and a wider route. The route to take will vary upon the chosen victory condition the player chooses to do.

Rout All Enemies

Send the majority of your forces to the left side then send about 2 units to the right (preferably a Thief and a healer). Have the two groups press forward on their chosen routes until they meet again at the center.

Defeating the Death Knight

Requirement: At least 2 units with an offensive battalion, an archer with a light weapon, and a high level spear user with the Knightkneeler Combat Art.

Note that the Death Knight won't attack the party as long as no unit stands adjacent to it or damages it.

The more rewarding of the 2 routes (specially if a high magic unit belongs to your house). Send all units to the right side. After reaching the area with several warp points, have a thief take the upper warp and upper right warp points. Then have everyone teleport to the center. Defeat all the enemies in the center and the units near the Death Knight.

Once all units have surrounded the Death Knight, have the units that can survive the Death Knight attack him (leave at least one space for the spear user's finishing attack). Once the Death Knight's HP is low enough, use the Knightkneeler ability to finish the battle.

Fire Emblem: Three Houses - Related Links

Part 1 - White Clouds Battle Walkthroughs

Part 1 - White Clouds
Prologue: A Skirmish At Dawn	Chapter 1: Rivalry of the Houses
Chapter 2: Red Canyon Dominance	Chapter 3: The Magdred Ambush
Chapter 4: Assault at the Rite of Rebirth Battle	Chapter 5: The Gautier Inheritance
Chapter 6: The Underground Battle	Chapter 7: Battle of The Eagle and Lion Battle
Chapter 8: The Remire Calamity	Chapter 9: Salvation at the Chapel
Chapter 10: Sealed Forest Snare	Chapter 11: Conflict in the Holy Tomb
Chapter 12: The Battle of Garreg Mach	Chapter 12: The Battle of Garreg Mach (Black Eagles)