Lost Halls

Last updated: Exalt Version (July 2020)
Lost Halls
Difficulty: 5Difficulty: 5Difficulty: 5Difficulty: 5Difficulty: 5
Teleportation Disabled
Music: Lost Halls

The Lost Halls is an endgame dungeon and the second-most challenging dungeon in the game. In addition to the main dungeon, there are 2 sub-areas, each with their own boss. The dungeon is a source of numerous stat potions, top-tier gear, a large number of powerful Untiered items, the Lost Golem ST Set, and the only source of the Helmet Rune.

The portal is a guaranteed drop from the Lost Sentry event boss, which spawns up to once per realm.


Lost Halls Key The Lost Halls Key is available in the Nexus for 200 Realm Gold.


See the Lost Halls Guide for a walkthrough on the dungeon.

The Realm Eye says:
Oryx’s takeover of the realm resulted in many different efforts to reclaim the land. While fighters such as yourself attacked directly, researchers explored more scientific solutions.
To safely conduct research inside the realm, an enormous network of experimentation rooms were built deep underground, spanning almost the entire realm.
Highly unethical tests took place in the now abandoned halls. Documentation in this library is limited, but I believe written texts with greater detail exist somewhere in this world.



Main Area

The Lost Halls is composed of a large “grid” of 8x8, 8x9, 9x8, or 9x9 rooms with hallways connecting them. Enemies are found in these rooms, with each room containing one Group Leader commanding their respective group. The rooms tend to look similar, but can have randomly-generated gimmicks found in them. These gimmicks range from beneficial to dangerous, such as arrow/bomb traps, ice tiles, Pure Evil, Marble Eyes that provide AoE status effects, etc.


  • Tiles of Water, Ice, or Pure Evil.
  • Un-walkable tiles scattered in the room.
  • Destructible walls found in various formations. Each wall has 12,000 HP.
  • Invincible Marble Colossus Pillars that fire at players. The types of shots each color of pillar fires can be found on their page.
  • Invincible Marble Eyes that inflict negative status effects to all players within 4.5 tiles, corresponding to their color.
    • Green Eyes inflict Slow
    • White Eyes inflict Weak
    • Orange Eyes inflict Daze
    • Black Eyes inflict Blind
    • Red Eyes inflict Curse
    • Pink Eyes inflict Bleeding
  • Arrow shooters in the walls that fire 150-damage arrows.
  • Bomb traps in the floor that constantly launch 150-damage AoE explosives. They come in two different types: one that fires at players and one that fires at itself.


  • Friendly (lighter-colored) Marble Pillars that inflict all enemies within 3 tiles with status effects.
    • Green Pillars inflict Slow
    • Orange Pillars inflict Daze
    • Red Pillars inflict Curse
    • Pink Pillars inflict Bleeding
  • Friendly (lighter-colored) Marble Eyes that give all players within 4.5 tiles positive status effects.
    • Green Eyes give Speedy
    • Orange Eyes give Berserk
    • Pink Eyes give Healing
    • Grey Eyes give Damaging
Lost Halls Layout

The dungeon is fairly big and the boss doesn’t have a Quest marker until found, making it very hard to navigate. To add an element of dread and suspense, an invincible, lethal enemy called the Spectral Sentry aimlessly roams the halls, attacking anyone that approaches with unstoppable force.

Enemies in the main dungeon are lumped into 4 categories: Lost Crusaders, Oryx Infantry, Grotto Beasts, and Lost Golems. Enemies will always be found in these groups, which are detailed below.

There are several notable rooms that are different from the others.

Starting Room

The Starting Room is a square room containing 1-4 Pillars inside, facing a wall. In order to enter the main dungeon, players will have to stand close to these Pillars to drop their invulnerability and kill them, opening up the corresponding path in the wall. Each pillar has 15,000 base HP, 35 DEF, and HP Scaling.

Pot Rooms

Exactly five of the seven dead ends have a multitude of Treasure Pots that can drop bonus loot such as Tinctures, Effusions, and Stat Pots. A number of the Pots will spawn Evil Spirits, but one of them will have a passive pink flame that will teleport itself to the Treasure Room boss. These flames are essential for accessing the secret area of the dungeon. Additionally, after a Flame is found, it becomes visible on the minimap, thereby revealing the location of the Treasure Room.

Treasure Room

One of the dead ends will be a Treasure Room. The Treasure Room is a large room identical to the ones normally found. It is completely empty except for the Treasure Room Boss, the Agonized Titan, in the middle and a locked portal to the Cultist Hideout.

Pre-Boss Room

The last dead end, just before the boss room, is a relatively empty room, containing only the Marble Defender. Once found, it will become each player’s Quest, making it easier to find for players that have split up. After being defeated, the wall behind it opens to the Boss Room.

Boss Room

The Boss Room is a large square room, much larger than the normal rooms found in the dungeon. The Boss resides in the middle of the room. This room has one entrance which is blocked off by the Marble Defender, and the entrance seals off after the boss is activated.


Lost Crusaders Oryx Infantry Grotto Beasts

Lost Golems Spectral Sentry Treasure Pot Room

Agonized Titan Marble Defender Marble Colossus

Cultist Hideout Cultist Fight The Void

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Note: Most the enemies here give abnormally high amounts of XP, especially the leaders of each group, which give a whopping 4000 EXP. This makes it attractive for those wishing to gain a lot of EXP, as clearing everything before the boss can easily get players over 40 fame.

Lost Crusaders

Oryx Infantry

Grotto Beasts

Lost Golems

Miscellaneous Enemies

Dungeon Miniboss

Marble Defender

Marble Defender

Dungeon Boss

Marble Colossus

Marble Colossus


Treasure Room Boss

Agonized Titan
Agonized Titan

The Agonized Titan is activated by collecting 5 pink flames from the Treasure Pot Rooms, upon which it will activate within 45 seconds. After defeating it, the Cultist Hideout will open.

Cultist Hideout

Last updated: X16.0.0
Locked Cultist HideoutCultist Hideout Portal
Difficulty: 5Difficulty: 5Difficulty: 5Difficulty: 5Difficulty: 5

Note that once you enter the Cultist Hideout, you can not go back to the Lost Halls.


Cultist Layout

The Cultist Hideout consists of a series of hallways made of brown bricks. The enemies are found in small groups throughout the dungeon. Malus and his cultists are found in a large square room with a pentagram in the middle.


Malus, Argus, Gaius, Basaran, and Dirge serve as the bosses of this dungeon. Malus is the leader and main boss.


Molek Molek

The Void

Last updated: X16.0.0
The Void
Difficulty: 5Difficulty: 5Difficulty: 5Difficulty: 5Difficulty: 5
Teleportation Disabled

The Void can be accessed by consuming a Vial of Pure Darkness once you defeat the Marble Colossus.


Void Layout

The Void consists of a large circular platform of purple tiles, in an expanse of Pure Evil. As time goes by, the platform will slowly get smaller as it is swallowed up by Pure Evil, and as the boss takes damage he will split the platform in two, and later in four.


Void Entity

Void Entity

Void Shades

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Tips and Strategies

A very high degree of teamwork and coordination is required to finish this dungeon. The layout is very confusing and the enemies require a large amount of combined DPS to take down. Stick together: spiltting up only makes it harder to take down the clusters of enemies.

Note, however, that there are no dead ends, meaning that any path leads to either the Boss, the Agonized Titan, or a Pot Room.

For Rogues who want to rush, beware of Grotto Blobs, Grotto Rats, Grotto Bats and Champions of Oryx, as they fire regardless of player presence. Especially beware the Grotto Rats, Grotto Blobs or Champions of Oryx - the first one because of their Quieting shots, the latter two because running into them will all but guarantee your death. This isn’t just for Rogue - it applies to all rushers.

It is important to remember that every enemy group has a different role to play in the dungeon. Keep their roles in mind when you engage them in combat. In addition, different groups in the Halls usually have common immunities and vulnerabilities.

  • All Group Leaders are immune to Paralyze and Stasis
  • All Group Members are immune to Stun
  • All normal enemies from the Cultist Hideout are not immune to anything
  • All normal enemies from The Void are not immune to anything

Always stay on guard in case the Spectral Sentry appears. In case it does, make sure you have a clear path to escape the Sentry. But be careful after 15 seconds it will teleport to the nearest player or decoy. It will do this twice before it despawns.

This dungeon has 2 different true objectives:

  • Gathering all pink flames on the map to kill the Agonized Titan to reach the Cultist Hideout to obtain the Vial of Pure Darkness.

  • Killing the Marble Colossus and then using the Vial of Pure Darkness to reach the Void and defeat the Void Entity.

Interestingly, in the Cultist Hideout, the correct path to choose at a branch is always the one with no beam hanging over it.

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Drops of Interest

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  • The dungeon was designed by Toastrz and Kiddforce, two players and former members of the User-Generated Content (UGC) group, who are now official DECA developers.
  • The original design document was made by Toastrz but the final version contained some noticeable differences and was “grander in scope.” The Records of the Lost Halls are a series of official lore entries that give backstory into the dungeon and hint at dungeon mechanics. The dungeon was released on August 1, 2017, coinciding with Month of the Mad God.
  • The dungeon has a trailer, released on July 25, 2017.
  • The current dungeon is more commonly known as “Lost Halls 2.0.” The “original” version of the dungeon (before Patch X.26.0.0) can be found here. The dungeon rework was due to several complaints that the main dungeon was too boring and tedious to clear, and often required large groups (30+ players) to complete in a timely manner. The update changed most enemy and boss behaviors, increased room variety, redid most of the artwork, buffed several Lost Halls UTs, and added HP scaling to all enemies to make the dungeon viable for most group sizes.
  • The Lost Halls was the most challenging dungeon in the game from its release in 2017 until July 2020, when its status was supplanted by Oryx’s Sanctuary.


  • The dungeon started development in October 2016, meaning that it had the longest development time of any dungeon, surpassing even The Nest. This isn’t counting the time taken to develop the second, improved version of the Lost Halls afterwards.
  • There are only 5 cultists but there are 7 Cultist Shots and Followers. This is referencing the 2 cultists (named Phaedra and Valus) that were killed in Malus’ lore.
    • As an easter egg, there is a rare chance to find a dead end in the Cultist Hideout containing two graves. This is likely also referencing the two deceased cultists.
  • There are a number of references in this dungeon.
    • The 5 Cultists (Malus, Gaius, Argus, Basaran, Dirge) are named after Colossi in the video game Shadow of the Colossus, including the 2 deceased onces (Phaedra and Valus). Most notably, Malus (the leader and main boss) is the name of the final Colossus.
    • The Void Entity’s lines “Ah, heroes, blessed souls…I shall destroy you with the power of darkness!” and “As your existence fades, remember that it is an honor to have it ended at my hands!” are both references to Super Paper Mario.
    • The Void Entity’s dying phrases were said to have been inspired by the opening lines of the Negativitron from LittleBigPlanet 2.
  • The Void has a portal sprite in the game files, which is also used for the dungeons completed statistic shown below. However, this is not actually used in the game. The portal is designated by a swirl of purple particles but does not have an actual portal sprite.
    Note: this sprite is also used for a consumable item for testing that directly opens a portal to The Void. There also exists a item that opens a portal directly to the Cult, and uses the regular sprite of a unlocked Cult Portal.
    Void Portal
  • There exists a internal version of the Lost Halls portal named “LH Test” used to test the dungeon with a Admin Item for debugging the dungeon.

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