The Unstable Portal: One-Shots Across the Multiverse
The Portal never leads to the same place twice—every session drops you into a new world with new rules, new threats, and no promises of return.
$20.00
/ Session
Details
Once / Friday - 1:00 AM UTC
Nov 7
Session Duration / 3–4 hours
0 / 6 Seats Filled
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About the adventure
The portal shimmers before you, unstable and unpredictable… What lies beyond? Welcome to The Unstable Portal, where every session takes you somewhere new—sometimes thrilling, sometimes eerie, sometimes downright ridiculous! One week, you might be unearthing a lost civilization, the next, you’re fleeing from an out-of-control gelatinous cube festival. Each adventure is a standalone one-shot, meaning you can drop in whenever the portal calls to you. I’ll announce the character level for each session ahead of time. Want to craft your own hero? Bring them in (D&D 2014 and 2024 rules)! Prefer to travel light? Choose from a spread of pre-made characters and dive right in—no prep required!
Game style
Puzzle / Mystery Focused
Meet the Game Master
3 years on StartPlaying
69 games hosted
Highly rated for: Creativity, Knows the Rules, Storytelling
Average response time: 1 hour
Response rate: 100%
About me
Hello, adventurers! I’m Mat, though some of my TTRPG friends have playfully nicknamed me “Diamat”—there’s a pun behind it that I might share one day. I’ve been immersed in TTRPGs for over 20 years, starting with classics like GURPS and Dungeons & Dragons 3rd Edition. Most of the games I have played in the last few years have been in D&D 5e, so I am well versed in that system. I also have plenty of experience with systems like Fate, Genesys, and Cypher. I particularly enjoy Genesys and Cypher for their focus on player agency in shaping the outcomes of rolls. In my games, storytelling and role-playing take center stage. If you join my table, expect your character’s story to weave seamlessly into the overarching narrative. Your character’s history and choices will have meaningful impacts. If you love TTRPGs for their storytelling and character development, we’ll be a perfect match—I promise to reciprocate with richly detailed worlds and vibrant, lifelike NPCs. While D&D holds a special place in my heart, I also have a passion for science fiction and science fantasy, drawing inspiration from authors like Jack Vance and Gene Wolfe. I enjoy putting unique twists on classic RPG genres, bringing fresh and imaginative perspectives to the table. I primarily run games on Roll20, where I’ve built an extensive library of assets. I invest time in creating immersive maps and handouts to enhance the atmosphere and bring my worlds to life. If all this sounds like your kind of adventure, reach out! I look forward to seeing you at one of my tables.
View Profile →Character creation
Creating your character
Pre-made characters are available every week. Bring your own character optional. Roll20’s charactermancer is available to anyone who joins the game and prefers to make a new character.
What to expect
Preparing for the session
Bring a sense of fun, flair, and flexibility. You never know where the portal will lead! A membership to discord and roll20 is required. BYOC (Bring Your Own Character) should be supplied at least an hour before game-time for vetting.
What Diamat (Mat) brings to the table
This week's adventure: Save a small town from a savage attack! 🌀 A New One-Shot Every Week – No long-term commitment, just pure adventure! 🌍 Genre-Bending Chaos – Horror, mystery, high-action, comedy—wherever the portal leads! 🛠️ Pre-Made Characters Available – Grab a character and go—no prep needed! 📜 Bring Your Own Character (Optional) – Just follow the weekly level announcement. ⚡ Fast-Paced & Cinematic – Rules-light, story-driven play with big moments. 🆕 Beginner-Friendly – New to D&D? I’ll guide you through the journey! Using Dungeons and Dragons 5e (2014)
Equipment needed to play
Computer
Internet
Microphone
Platforms used
Safety
How Diamat (Mat) creates a safe table
Safety documents will be linked through Discord. X,N,O's are digital through Game Master direct message.
Content warnings
Safety tools used