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Owned by Jonah

Game Master's Laboratory

241 members • Free

Game Masters teaching and learning how to run better tabletop role-playing games. One day we hope this group will host the best games in the world!

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121 contributions to Game Master's Laboratory
Skill Challenge Difficulty Calculator
In the book, Jonah and Tristan pitch an expanded view of Skill Challenges as an effective mechanic for many non-combat encounters and situations. If you haven't read it, I highly recommend the chapter, but the short version is that players make a series of naratively relevant skill checks trying to get 8 successes before 3 failures (the race to the finish and press your luck variants are awesome). They suggest setting DCs in d20 games so a 7 or 8 is required for success depending on the situation. I worked with a data scientist friend to make a jupyter notebook to run simulations to model the skill challenges from Chapter 4 of Collaborative Campaign Design. We are using the PF2e four degrees of success (10+ and 10-, and 20 or 1 upgrades or downgrades one degree of success). We decided a crit would provide one token and remove one of the other type. The model assumes no use of aid or reroll mechanics (hero points, inspiration, etc). Results below. i know, i know, reporting averages for asymmetric data, forgive me BINARY, 8 successes before 3 failures, 10000 simulations DC6 - 74.9% check success, 68.3% challenge success, 9.3 checks required DC7 - 70.4% check success, 53.8% challenge success, 9.0 checks required DC8 - 65.1% check success, 36.9% challenge success, 8.3 checks required DC9 - 59.8% check success, 22.5% challenge success, 7.5 checks required RACE, 8 successes, with a variable number of consequences due to failures, 10000 simulations DC6 - 1.3 average, 1.0 median failures with 11.2 checks DC7 - 2.1 average, 2.0 median failures with 12.2 checks (histogram shown) DC8 - 3.2 average, 3.0 median failures with 13.2 checks DC9 - 4.5 average, 4.0 median failures with 14.3 checks PRESS, variable success at 2 failures (stopping before risking 3), 100000 simulations DC6 - 8.4 ave, 6 median successes with 11.9 checks DC7 - 5.8 ave, 4 median successes with 8.9 checks (histogram shown) DC8 - 4.2 ave, 3 median successes with 6.9 checks DC9 - 3.2 ave, 2 median successes with 5.6 checks
Skill Challenge Difficulty Calculator
2 likes • 26d
This is absolutely fantastic Eric, thank you! The numbers in the book are simple probabilities unfortunately - I didn't do anything nearly this cool to find them. I am actually surprised to see that the number 7 holds even for a more sophisticated "degrees of success" system. Huh. A better mathematician than me might be able to figure out why that is.
Stealth Mechanic for game that is not just rerolling?
Does anyone have a way of handling an ongoing stealth mechanic rather than just re-rolling stealth? I'm making a one shot for the back of my book that is modeled on Metal Gear Solid.
1 like • Sep 8
Great news, @Tristan Fishel solved stealth recently - that is, he came up with a system-agnostic structure for running stealth encounters that I have been running extensively and that I absolutely love. I will let him post the excerpt if he is comfortable with it - if not I will paraphrase
Hello Chummers
Does anyone else play Shadowrun? Or is this mainly or exclusively a 5E community?
2 likes • Aug 28
Not a 5e community at all! We have veterans of a lot of different systems here. I think 5e is the common language for a lot of people by default, so we kind of slump into that by default. Right now, I'm running 13th Age (1e and 2e, separately) and CBR*PNK. I'm considering Daggerheart for the memes, but I don't know when that would be.
NPC template
Okay so forgive me if it's ALL covered in the classroom, but I loved the concept of having goals for NPC's so I added it to my NPC making template. Is there anything I'm missing? - Name: - Profession/Vocation: - Appearance: - Personality: - Fears/phobias: roll d6 1 spiders 2 snakes 3 heights 4 water drowning 5 enclosed spaces 6 something oddly specific like having their back to a window, or the number 13 - Strengths: - Weaknesses: - Mannerisms: - Voice: - Short and long term goals:
2 likes • Aug 28
@Scott Brewer hit the big one for me, I think - faction affiliation is really helpful for off-the-cuff interactions. If you know the faction goals/motivations, it's really easy to decide what an NPC would do in a given situation. I take this a little farther and don't prep individual NPCs most of the time - just roles and faction affiliation: "captain of the guard", "foot soldier in the Duke's army", etc. I can improv a name. That's just because I'm not a big prepper, though, I think my games would probably be better if I did more with my NPC notes 😅
OFFICIAL GENCON THREAD
Happy GenCon 2025 to all who observe! Those of you who are attending, those of you have in the past, tell us about it! 1. What are the must-see/must-do events and experiences? 2. What are you doing this year that you're most looking forward to? 3. What is your best tip for con-goers to get the most out of the experience? If you're here in Indy, let's hang out - let us know you're in town and we will put something together!
OFFICIAL GENCON THREAD
1 like • Aug 1
@Briggs Schneider this sounds awesome, thanks for the tip! We will check it out Saturday, I think - today somehow totally filled up
4 likes • Aug 3
Not a great picture of any of us, but we did meet Ginny in person at last!
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Jonah Fishel
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@jonah-fishel-3792
Building a space for GMs to teach and learn how to run better games. Authors of "The Game Master's Handbook of Proactive Role-Playing".

Active 24d ago
Joined Aug 6, 2024
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