Doors to the Unknown

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Doors to the Unknown is a 71-page sourcebook for Advanced Dungeons & Dragons 2nd edition released in November 1996.

Official synopsis[]

Four doors of mystery appear in the Cage. They lead to four adventures, if a basher has the dark of them.
"These aren't doors in the traditional sense, cutter, but they're portals just the same. They appear for a short time every 500 years, popping up in different parts of Sigil. Each hides a mystery that's waiting to be solved, and together they just might hold the key to a secret of the multiverse. All a body's got to do is tumble to the right keys, open the doors, and face down the Unknown."
- Estavan, merchant lord
Doors to the Unknown is a collection of four Planescape adventures that can be played separately or as a mini-campaign. When four doors appear in the Cage, the barmies crawl out of the shadows, and the heroes get drawn into events that could have consequences for the entire multiverse. Each door leads to a different plane and a different deadly challenge for the player characters. Together they offer a way to stop an ancient menace before it strikes again.
The Planescape Campaign Setting boxed set is required to run these adventures. The Planescape Monstrous Compendium Appendix (I and II) and Uncaged: Faces of Sigil are recommended to enhance play.
For 4 to 6 Players of 2nd to 10th levels

Content[]

Development and release[]

Development[]

The book was written by Bill Slavicsek. Art was provided by Robh Ruppel, Adam Rex, Brian DeSpain and Tony DiTerlizzi.

Release[]

Doors to the Unknown was released by TSR in November 1996 for $^{[missing data]} US or $^{[missing data]} Canadian.

On February 28, 2017, it was re-released in digital format. It is currently available on DriveThruRPG and Dungeon Masters Guild for $4.99.

Reception and influence[]

Critical reception[]

As of 2023, Doors to the Unknown reached the rank of Gold seller on DriveThruRPG.

Influence on other works[]

External links[]

References[]

Advanced Dungeons & Dragons 2nd edition
Core rules
Player's Handbook • Dungeon Master Guide Monstrous Compendium Volume One • Monstrous Compendium Volume Two • Monstrous Manual First Quest • Introduction to Advanced Dungeons & Dragons Game • The Complete Starter Set • Dungeons & Dragons Adventure Game
Optional core rules
Player's Option: Combat & Tactics • Player's Option: Skills & Powers • Player's Option: Spells & Magic Dungeon Master Option: High-Level Campaigns • Campaign Option: Council of Wyrms
Supplement lines
Player's Handbook Rules Supplement • Dungeon Master's Guide Rules Supplement Monstrous Compendium Appendix • Monstrous Compendium Annual Encyclopedia Magica • Historical Reference • The Magic Encyclopedia • Monstrous Arcana • Priest's Spell Compendium • Wizard's Spell Compendium
Other supplements
Bastion of Faith • Book of Artifacts • Castle Sites • Chronomancer • City Sites • College of Wizardry • Country Sites • Den of Thieves • Dungeon Builder's Guidebook • Guide to Hell • Legends & Lore • Rogues' Gallery • Shaman • Tome of Magic • The Vortex of Madness and Other Planar Perils • Warriors of Heaven • World Builder's Guidebook
Adventures
The Apocalypse Stone • Axe of the Dwarvish Lords • Cleric's Challenge (II) • The Dancing Hut of Baba Yaga • Destiny of Kings • Die Vecna Die! • Dragon Mountain • Dungeons of Despair • Fighter's Challenge (II) • The Gates of Firestorm Peak • A Hero's Tale • Labyrinth of Madness • The Lost Shrine of Bundushatur • Moonlight Madness • The Murky Deep • Night Below: An Underdark Campaign • A Paladin in Hell • Return to the Tomb of Horrors • Reverse Dungeon • Road to Danger • The Rod of Seven Parts • The Shattered Circle • The Silver Key • Swamplight • Tale of the Comet • Tales of Enchantment • Temple, Tower, & Tomb • Thief's Challenge (II) • TSR Jam 1999 • Wizard's Challenge (II)