Undercroft -- Path of Exile
A Sanctum run contains 4 floors, each containing 8 rooms. The 8th room of each floor always contains a Boss. Players can choose to engage in a room every time they encounter the portal to the Sanctum in an area or map, or defer up to 8 rooms (1 floor) to be run consecutively at a later time. Crashing during a Sanctum room will reset progress for that room and will resume the same area on your next map. Aureus and rewards are only locked in upon successful completion of a room. Each Sanctum run is independent between characters on the same account.
Undercroft Sanctum Room
| Name | Icon | Floor | Contains |
|---|---|---|---|
| Undercroft | Sanctum Necropolis |
All room types other than boss rooms can become Afflicted. Afflicted rooms are indicated by a purple border and cause the character to gain an Affliction on entry.
Each room contains several Guard unique monsters, as well as one of three tasks to complete the room:
- Find the Exit (locate the exit door)
- Defeat all the Guards (defeat every unique Guard)
- Survive (avoid the traps)
- Defeat the Boss (minibosses based on map bosses)
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Ah, the Undercroft in The Forbidden Sanctum! These shadowy passages offer a swift but sometimes perilous path to progress within the depths of the Templar sanctum. Here's what you can expect:
Layout:
- The Undercroft typically features narrow, winding corridors shrouded in darkness or eerie mist. Cobblestones might line the floor, and ancient torches or glowing fungi provide limited illumination.
- Several paths might be available, often leading to dead ends, hidden passages, or shortcuts that bypass sections of the main Sanctum floors.
Challenges:
- Darkness and Obstacles: The darkness can obscure enemies and hazards, making navigation and combat more challenging. Be mindful of walls, pillars, or protruding structures you might collide with in the gloom.
- Traps and Ambushes: Hidden blade traps, fire geysers, or dart traps might be disguised within the darkness. Listen for telltale sounds or observe subtle visual cues to avoid triggering them.
- Surprise Encounters: Lurking in the shadows might be elite mobs, patrolling guards, or even unique mini-bosses. Maintain situational awareness and be prepared for sudden encounters.
Rewards:
- Faster Progress: Navigating the Undercroft successfully allows you to bypass sections of the main Sanctum, potentially saving time and resources.
- Hidden Chests: Certain Undercroft paths might lead to secret alcoves or hidden chambers containing valuable Sanctum Chests, offering loot like currency shards, Offering Vessels, or Relics.
- Surprise Boons: In rare cases, the Undercroft might even house an Offering Altar where you can sacrifice an Offering Vessel for a permanent, powerful boon, significantly impacting your Sanctum run.
Tips for Conquering the Undercroft:
- Light Sources: Consider using flares, illuminated items, or skills like Flame Dash to pierce the darkness and reveal potential hazards.
- Movement Skills: Dashes, blinks, or phase steps can help you navigate tight spaces, dodge surprise attacks, and escape dangerous situations quickly.
- Defensive Preparations: Be prepared to face elite enemies unexpectedly. Maintain flasks, potions, and defensive skills readily available for sudden encounters.
- Listen Closely: Footsteps, drips, or the clang of metal on stone can alert you to nearby enemies or hidden mechanisms.
- Explore Prudently: Don't rush blindly through the darkness. Move cautiously, observe your surroundings, and be ready to turn back if you encounter a dead end or an overwhelming threat.
Overall, the Undercroft in The Forbidden Sanctum offers a risky but potentially rewarding shortcut within the depths of the sanctum. By employing caution, awareness, and strategic use of light and movement skills, you can navigate the shadowed passages swiftly, avoid hidden dangers, and potentially claim valuable rewards hidden within the darkness. Remember, Exiles, sometimes the quickest path isn't always the safest, but with a keen eye and a brave heart, you can conquer the Undercroft and emerge victorious!
List of Sanctum Rooms
| Name | Icon | Floor | Contains |
|---|---|---|---|
| Abandoned Library | Sanctum Archives | ||
| Templar Annals | Sanctum Archives | ||
| Chambers of Inscription | Sanctum Archives | ||
| Holy Trials | Sanctum Archives | ||
| Scriptorium | Sanctum Archives | ||
| Candlelit Chapel | Sanctum Archives | ||
| Merchant |  | Sanctum Archives | Contains Merchant |
| Accursed Pact |  | Sanctum Archives | Contains Accursed Pact |
| Fountain |  | Sanctum Archives | Contains Fountain |
| Afflicted Fountain |  | Sanctum Archives | Contains Afflicted Fountain |
| Benevolent Fountain |  | Sanctum Archives | Contains Benevolent Fountain |
| Radiant Fountain |  | Sanctum Archives | Contains Radiant Fountain |
| Offer |  | Sanctum Archives | Offers Items on Completion |
| Major Treasure |  | Sanctum Archives | Contains Major Treasure Reward |
| Minor Treasure |  | Sanctum Archives | Contains Minor Treasure Reward |
| Candlelit Chapel |  | Sanctum Archives | Contains Varakath, the Waxen |
| Battleground | Sanctum Vaults | ||
| Decrepit Cellar | Sanctum Vaults | ||
| Derelict Caverns | Sanctum Vaults | ||
| Gauntlet | Sanctum Vaults | ||
| Reliquary | Sanctum Vaults | ||
| Experimentation Chamber | Sanctum Vaults | ||
| Merchant | | Sanctum Vaults | Contains Merchant |
| Accursed Pact | | Sanctum Vaults | Contains Accursed Pact |
| Fountain | | Sanctum Vaults | Contains Fountain |
| Afflicted Fountain | | Sanctum Vaults | Contains Afflicted Fountain |
| Benevolent Fountain | | Sanctum Vaults | Contains Benevolent Fountain |
| Radiant Fountain | | Sanctum Vaults | Contains Radiant Fountain |
| Offer | | Sanctum Vaults | Offers Items on Completion |
| Major Treasure | | Sanctum Vaults | Contains Major Treasure Reward |
| Minor Treasure | | Sanctum Vaults | Contains Minor Treasure Reward |
| Candlelit Chapel |  | Sanctum Vaults | Contains Braom and Uzar, the Experiments |
| Halls of Worship | Sanctum Cathedral | ||
| Unholy Lair | Sanctum Cathedral | ||
| Infernum | Sanctum Cathedral | ||
| Crucible | Sanctum Cathedral | ||
| Sanctum Bellum | Sanctum Cathedral | ||
| Hall of Mirrors | Sanctum Cathedral | ||
| Merchant | | Sanctum Cathedral | Contains Merchant |
| Accursed Pact | | Sanctum Cathedral | Contains Accursed Pact |
| Offer | | Sanctum Cathedral | Offers Items on Completion |
| Fountain | | Sanctum Cathedral | Contains Fountain |
| Afflicted Fountain | | Sanctum Cathedral | Contains Afflicted Fountain |
| Benevolent Fountain | | Sanctum Cathedral | Contains Benevolent Fountain |
| Radiant Fountain | | Sanctum Cathedral | Contains Radiant Fountain |
| Major Treasure | | Sanctum Cathedral | Contains Major Treasure Reward |
| Minor Treasure | | Sanctum Cathedral | Contains Minor Treasure Reward |
| Candlelit Chapel |  | Sanctum Cathedral | Contains Xenathar, Templar Reaper |
| Lost Catacombs | Sanctum Necropolis | ||
| Desecrated Crypts | Sanctum Necropolis | ||
| Undercroft | Sanctum Necropolis | ||
| Entombment | Sanctum Necropolis | ||
| Mausoleum | Sanctum Necropolis | ||
| Sanctum Sanctorum | Sanctum Necropolis | ||
| Fountain | | Sanctum Necropolis | Contains Fountain |
| Afflicted Fountain | | Sanctum Necropolis | Contains Afflicted Fountain |
| Benevolent Fountain | | Sanctum Necropolis | Contains Benevolent Fountain |
| Radiant Fountain | | Sanctum Necropolis | Contains Radiant Fountain |
| Merchant | | Sanctum Necropolis | Contains Merchant |
| Accursed Pact | | Sanctum Necropolis | Contains Accursed Pact |
| Offer | | Sanctum Necropolis | Offers Items on Completion |
| Major Treasure | | Sanctum Necropolis | Contains Major Treasure Reward |
| Minor Treasure | | Sanctum Necropolis | Contains Minor Treasure Reward |
| Candlelit Chapel |  | Sanctum Necropolis | Contains Lycia, Unholy Heretic |