Honkai Star Rail | Time-Limited Event: Underground Treasure Hunt Walkthrough

Underground Treasure Hunt Event Guide for Honkai: Star Rail. Learn how to unlock levels & ruins, rules, items, buffs, and rewards.

What Is Underground Treasure Hunt

Open The Squares To Find The Door Card

To progress to the next level, you must unlock the squares marked with a pickaxe and obtain a Door Card. As you open each square, you may see icons like treasures or enemies.

Luxurious Rewards Are Available!

You can earn Stellar Jade and Upgrade Materials as rewards. It's quite simple to collect Stellar Jade, so it's advisable to gather them whenever possible.

How To Play

Consume Stamina To Open Squares

To open a square marked with a pickaxe, you can use up your Stamina. If your Stamina reaches zero, you can use 5% of your character's HP to open the square. However, if your character's HP also reaches zero, the challenge will fail.

Find The Door Card And Go To The Next Level

When you find a Door Card, the stairway at your starting point becomes unlocked, allowing you to move to the next level. It is advisable to progress to the next level promptly, conserving your Stamina.

Defeat All Enemies At The Final Level To Complete It

To finish the last level, you must beat all the enemies instead of looking for the Door Card. Once you complete it, you'll gain access to "Deep Exploration" and "Next Ruin."

Tips To Progress

The Arrangement Of The Squares Follows A Pattern

▲ The 1st Level of Deep in Ruin 1 is randomly selected from a map inverted from left to right.

The squares' arrangement follows a regular yet random pattern. Each pattern is reflected horizontally or vertically from a fixed pattern, making it possible to predict the contents of the squares based on their initial positions.

[Top Priority] Beat Enemies With Surprise Attack

The Enemy - Surprise Attack Ability with the arrow icon will reduce your Stamina for every three turns, and it is best to keep one Ancient Bomb to defeat the Enemy with Surprise Attack Ability quickly.

In Deep Exploration, Go To The Next Level Without Stopping

In Deep Exploration, Stamina does not regenerate as you progress through levels. Therefore, when you find a Door Card, it's best to move to the next level without wasting any Stamina. You can also collect items that you come across, as doing so will not consume Stamina.

Stamina Recovered By Moving Through Levels

If You Can't Beat The Enemy, Try Again

Even if you fail or quit in the middle of a battle, the ATK and DEF buffs will still be inherited. If you find the enemy too powerful to defeat, keep trying until your buffs are enhanced.

Ruin 1 Walkthrough

Stage Features

ATK Buff	- DMG Boost - DoT Boost
DEF Buff	- DMG Reduction
Enemies

Arrangement Of Enemies And Door Card

The arrangement of the Enemies and Door Cards squares is randomly flipped in any direction. Use the initial position information to predict the arrangement.

Arrangement Of Surface Exploration

Example of Arrangement
Surface Level 1	Surface Level 2
Surface Level 3	Surface Level 4
Surface Level 5	Surface Level 6
Surface Level 7	Surface Level 8

Arrangement Of Deep Exploration

Example of Arrangement
Deep Level 1	Deep Level 2
Deep Level 3	Deep Level 4
Deep Level 5	Deep Level 6

Ruin 2 Walkthrough

Stage Features

ATK Buff	- DMG Boost - Break Effect Boost
DEF Buff	- DMG Reduction
Enemies

Arrangement Of Enemies And Door Card

The arrangement of the Enemies and Door Cards squares is randomly flipped in any direction. Use the initial position information to predict the arrangement.

Arrangement Of Surface Exploration

Example of Arrangement
Surface Level 1	Surface Level 2
Surface Level 3	Surface Level 4
Surface Level 5	Surface Level 6
Surface Level 7	Surface Level 8

Arrangement Of Deep Exploration

Example of Arrangement
Deep Level 1	Deep Level 2
Deep Level 3	Deep Level 4
Deep Level 5	Deep Level 6

Ruin 3 Walkthrough

Stage Features

ATK Buff	- DMG Boost - Follow-up attack DMG increases
DEF Buff	- DMG Reduction
Enemies

Arrangement Of Enemies And Door Card

The arrangement of the Enemies and Door Cards squares is randomly flipped in any direction. Use the initial position information to predict the arrangement.

Arrangement Of Surface Exploration

Example of Arrangement
Surface Level 1	Surface Level 2
Surface Level 3	Surface Level 4
Surface Level 5	Surface Level 6
Surface Level 7	Surface Level 8

Arrangement Of Deep Exploration

Example of Arrangement
Deep Level 1	Deep Level 2
Deep Level 3	Deep Level 4
Deep Level 5	Deep Level 6

Ruin 4 Walkthrough

Stage Features

ATK Buff	- DMG Boost - Basic ATK DMG increases
DEF Buff	- DMG Reduction
Enemies

Arrangement Of Enemies And Door Card

The arrangement of the Enemies and Door Cards squares is randomly flipped in any direction. Use the initial position information to predict the arrangement.

Arrangement Of Surface Exploration

Example of Arrangement
Surface Level 1	Surface Level 2
Surface Level 3	Surface Level 4
Surface Level 5	Surface Level 6 *Even if you obtain two keys, you cannot carry them to the next level.
Surface Level 7	Surface Level 8

Arrangement Of Deep Exploration

Example of Arrangement
Deep Level 1	Deep Level 2
Deep Level 3	Deep Level 4 *Even if you obtain two keys, you cannot carry them to the next level.
Deep Level 5	Deep Level 6

Ruin 5 Walkthrough

Stage Features

ATK Buff	- DMG Boost - DoT Boost
DEF Buff	- DMG Reduction
Enemies

Arrangement Of Enemies And Door Card

The arrangement of the Enemies and Door Cards squares is randomly flipped in any direction. Use the initial position information to predict the arrangement.

Arrangement Of Surface Exploration

Example of Arrangement
Surface Level 1	Surface Level 2
Surface Level 3	Surface Level 4
Surface Level 5	Surface Level 6
Surface Level 7	Surface Level 8

Arrangement Of Deep Exploration

Example of Arrangement
Deep Level 1	Deep Level 2
Deep Level 3	Deep Level 4
Deep Level 5	Deep Level 6
Deep Level 7	Deep Level 8
Deep Level 9	Deep Level 10

List Of Square Icons

Item	Effect
Ancient Weapon	Provides ATK Buff
Ancient Armor	Provides DEF Buff
Provision Supply	Restores 3 Stamina
Provision Supply 2	Restores 6 Stamina
Healing Supply	Restores HP
Door Card	Allows you to move to the next level
Ancient Bomb	Defeats 1 Normal Enemy
Ancient Relic	Comes with Challenge Objectives, upon completion, you will receive rewards.
Treasure Chest	Provides random items
Trial Character	A character will join up and become selectable in battles.
Enemy - Lockdown Ability	Locks down all surrounding areas
Enemy - Surprise Attack Ability	For every 3 actions the Treasure Hunter takes, the enemy will reduce your Stamina by 5. The amount of Stamina to be reduced increases for Elites and Bosses.
Enemy - Summoning Ability	For every four actions the Treasure Hunter takes, the enemy summons one enemy with Lockdown Ability.
Enemy - Growth Ability	The enemy strengthens itself for every three actions the Treasure Hunter takes. Can be enhanced up to 10 times. Locks down the nearby areas.
Enemy - Garrison Ability	Drops a Door Card when defeated. The enemy strengthens itself based on the number of unexplored surrounding areas.
Enemy - Support Ability	The enemy strengthens all visible enemies around the area.
Enemy - Golden Treasure Ability	The enemy drops items like Ancient Relics and Door Cards when the Trotter is defeated.

List Of Rewards

Rewards From Ruin 1~4

Requirement	Rewards
Complete Surface Exploration level 4	Stellar Jade ×80 Obsidian of Obsession ×2 Obsidian of Desolation ×6
Complete Surface Exploration level 8	Stellar Jade ×80 Obsidian of Obsession ×2 Obsidian of Desolation ×6
Complete Deep Exploration level 2	Stellar Jade ×40 Traveler's Guide ×8 Obsidian of Desolation ×3
Complete Deep Exploration level 4	Relic Remains ×30 Traveler's Guide ×4 Credits ×60000
Complete Deep Exploration level 6	Relic Remains ×10 Credits ×60000

Rewards From Ruin 5

Requirement	Rewards
Complete Surface Exploration level 4	Tracks of Destiny ×1 Stellar Jade ×80 Bubble "Where's the Rabbit? "
Complete Surface Exploration level 8	Stellar Jade ×80 Obsidian of Obsession ×2 Obsidian of Desolation ×6
Complete Deep Exploration level 2	Stellar Jade ×40 Traveler's Guide ×8 Obsidian of Desolation ×3
Complete Deep Exploration level 4	Relic Remains ×30 Traveler's Guide ×4 Credits ×60000
Complete Deep Exploration level 6	Relic Remains ×10 Credits ×60000

Other Rewards

Requirement	Rewards
Complete Deep Exploration level 2 for all ruins	Self-Modeling Resin ×1

Honkai: Star Rail Related Guides

Recommended For Beginners

Early Game Tips

Early Game Guide
Daily To Do's	Reroll Tier List

Character Builds And Leveling Up

Character Build Guide
Level Up Guide	Ascension Guide And Materials
How To Reroll Relics	Upgrade Light Cones

Game Mechanics

Trailblaze Level Guide	Best Team Comps
Settings Guide	Consumables Guide
How To Change Profile	How To Add Friends
Data Bank Explained	Messages Guide

Database

Characters & Equipment
All Characters List
All Light Cones														Relic Sets List														Max Stats List
Character Tier List														Best Relics For Character														Upgrade Materials List
Voice Actors List
Characters By Rarity
5-Star																					4-Star
Characters By Combat Type
Physical						Fire						Ice						Lightning						Wind						Quantum						Imaginary
Characters By Path
Destruction						Hunt						Erudition						Harmony						Nihility						Preservation						Abundance