Introductory Session: DEEP CARBON OBSERVATORY (Dungeons & Dragons B/X)

Old School Essentials, Dungeons & Dragons B/X on Discord, Owlbear Rodeo

Old School Essentials


Owlbear Rodeo

About the adventure

Time-Traveling Sentient Velociraptors! An entire dimension of compressed vampires and a biopsy of the Tarrasque! A cow-sized platypus bent on destruction! Cannibals! Lots of cannibals! All these things and more await you in the gonzo-edgy-indie-artsy-absurdist-grimdark-critically-acclaimed OSR module DEEP CARBON OBSERVATORY! We'll be using the system it was designed for - Dungeons & Dragons B/X! This is the first session in a campaign: This session is $5 and will include establishing bonds and relationships between characters, and the beginning of the scenario. Future sessions will be $20.

Professional Game Master

Josh Ervin (Ironic Hero Games)


59 Reviews

Game Designer

30 years as a TTRPG player

30 years as a Game Master

423 games hosted

Brings Thousands of Digital Minis, Hundreds of Virtual Battlemaps, Large Swaths of D&D Beyond Content to the table

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Josh Ervin (Ironic Hero Games) profile

Additional Details

How to prepare

No actual experience is necessary. I will explain basic rules during character creation or during the first session. I have online dice rollers you can use, although if you have your own dice at home you're welcome to use them. All you need is a mic to be heard, a camera to be seen (preferably), and a relatively quiet place to play. I will provide everything else.

What I provide

Both versions of DEEP CARBON OBSERVATORY - the original and remastered editions. Hours spent studying the module, making notes and play aides. Pregenerated characters. My own art based on the module's style and tone. A campaign wiki/journal/forum maintained as we play 24/7 access to me via Discord (well not really...I sleep!) All the other usual stuff :)

Gameplay details

This game will use the 1981 Dungeon Dragons Basic Expert Set, using the Old School Essentials retroclone as a reference. I will be using the Ascending Armor Class optional rule. Characters will start at 20,000 XP (5th Level for most classes). You can make your own character using the B/X rules, schedule a free meeting with me beforehand (at least 24 hours in advance) or use a pregen I will provide. We'll play in 3 to 4 hour sessions, and all images will be Scrap Princess's art from the module (both the Original and Remastered versions), the Dirk Dietwieller Leichy maps from the Remastered version, and my own original art created to mimic Scrap Princess's distinctive style. As we play, I will make PC portraits in this style for use as tokens and visual aides. I will maintain an Obsidian Portal campaign site that records adventure logs, NPCs, maps, a wiki, etc. and a dedicated Discord server for the campaign.

Content warnings


Safety tools used


How will character creation work

Characters will start at 5,000 XP (3rd Level for most classes) You can schedule a free meeting with me to make a character together (at least 24 hours in advance), or if you are familiar with the rules you can make your own and send me a copy. I have form-fillable PDFs you can use to track your character. If you join up on the day of the campaign or just don't want to make your own character, I have a full compliment of pregenerated characters you can use.

Players can expect

  • Combat/Tactics: Medium
  • Roleplay: High
  • Puzzles: Medium
  • Experience Level: Open to all

Player reviews (59)

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Introductory Session: DEEP CARBON OBSERVATORY (Dungeons & Dragons B/X)

59 Reviews

Price per player-session
You will be charged when a session starts


  • Duration: 3 to 4 hours
  • Number of players: 2 to 6 players
  • Experience required: Open to all
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