Arrhenius (Out now on itch.io!)
@arrhenius.bsky.social
He/Him. Official Bluesky account for Arrhenius, the #ttrpg set 100,000 years in the future during the next Ice Age.
Available now! https://jesseharlin.itch.io/arrhenius
https://www.drivethrurpg.com/en/product/476741/arrhenius-an-icecore-roleplaying-game
Available now! https://jesseharlin.itch.io/arrhenius
https://www.drivethrurpg.com/en/product/476741/arrhenius-an-icecore-roleplaying-game
Pinned
ARRHENIUS by Dungeonteller
A Far-Future Ice Age TTRPG Set in the Year 100,000
jesseharlin.itch.io
New York’s hottest #ttrpg is Arrhenius. IT. HAS. EVERYTHING.
✅Exploding dice
✅Psychotropic eel poop
✅Feral AI
✅Human snowpants
(What’s “human snowpants”?)
It’s that thing of when a robot decides it isn’t human enough so it skins you and wears it out on the glaciers.
jesseharlin.itch.io/arrhenius
✅Exploding dice
✅Psychotropic eel poop
✅Feral AI
✅Human snowpants
(What’s “human snowpants”?)
It’s that thing of when a robot decides it isn’t human enough so it skins you and wears it out on the glaciers.
jesseharlin.itch.io/arrhenius
Always repost #Arrhenius being smart posts.
#Martian
On this sol in 160 (1911 April 23):
DOUBTS LIFE ON MARS.
Dr. Arrhenius Says So-Called Canals Resemble Earthquake Lines.
www.nytimes.com/1911/04/23/a...
On this sol in 160 (1911 April 23):
DOUBTS LIFE ON MARS.
Dr. Arrhenius Says So-Called Canals Resemble Earthquake Lines.
www.nytimes.com/1911/04/23/a...
DOUBTS LIFE ON MARS.; Dr. Arrhenius Says So-Called Canals Resemble Earthquake Lines. (Published 1911)
www.nytimes.com
January 17, 2026 at 4:28 AM
Always repost #Arrhenius being smart posts.
Reposted by Arrhenius (Out now on itch.io!)
Hi #PortfolioDay - I am Kim Hu 👋
Freelance Illustrator & Concept Artist
In case you have been following me for a while and always wanted to work with me, NOW IS YOUR CHANCE!
I am filling my books for 2026 ✌️💫
Portfolio: kim-hu.com
✉️ hello@kim-hu.com
Freelance Illustrator & Concept Artist
In case you have been following me for a while and always wanted to work with me, NOW IS YOUR CHANCE!
I am filling my books for 2026 ✌️💫
Portfolio: kim-hu.com
✉️ hello@kim-hu.com
January 13, 2026 at 4:31 PM
Hi #PortfolioDay - I am Kim Hu 👋
Freelance Illustrator & Concept Artist
In case you have been following me for a while and always wanted to work with me, NOW IS YOUR CHANCE!
I am filling my books for 2026 ✌️💫
Portfolio: kim-hu.com
✉️ hello@kim-hu.com
Freelance Illustrator & Concept Artist
In case you have been following me for a while and always wanted to work with me, NOW IS YOUR CHANCE!
I am filling my books for 2026 ✌️💫
Portfolio: kim-hu.com
✉️ hello@kim-hu.com
Reposted by Arrhenius (Out now on itch.io!)
Have me in mind for you landscape painting needs in 2026!
January 13, 2026 at 10:33 PM
Have me in mind for you landscape painting needs in 2026!
Reposted by Arrhenius (Out now on itch.io!)
#OperationInternet update: 1 day in
We’re off to a great start! 3 people bought the book yesterday and page views were 3x normal.
So, if there are 6.04 billion internet users, yesterday puts us at only (checks math…) 6,039,999,997 sales to go until everyone who uses the internet buys a copy! #🤘
We’re off to a great start! 3 people bought the book yesterday and page views were 3x normal.
So, if there are 6.04 billion internet users, yesterday puts us at only (checks math…) 6,039,999,997 sales to go until everyone who uses the internet buys a copy! #🤘
I did the math:
If everyone who uses the internet just bought one copy of my book, then I could retire and make more #ttrpgs. And since I’m not an artist, that means I’d have to hire tons of artists. Which is what I want to do anyway.
It’s all win/win. I call it #OperationInternet.
If everyone who uses the internet just bought one copy of my book, then I could retire and make more #ttrpgs. And since I’m not an artist, that means I’d have to hire tons of artists. Which is what I want to do anyway.
It’s all win/win. I call it #OperationInternet.
ARRHENIUS | An Icecore Roleplaying Game by Dungeonteller
A Far-Future Ice Age TTRPG Set in the Year 100,000
jesseharlin.itch.io
January 12, 2026 at 10:29 PM
#OperationInternet update: 1 day in
We’re off to a great start! 3 people bought the book yesterday and page views were 3x normal.
So, if there are 6.04 billion internet users, yesterday puts us at only (checks math…) 6,039,999,997 sales to go until everyone who uses the internet buys a copy! #🤘
We’re off to a great start! 3 people bought the book yesterday and page views were 3x normal.
So, if there are 6.04 billion internet users, yesterday puts us at only (checks math…) 6,039,999,997 sales to go until everyone who uses the internet buys a copy! #🤘
Reposted by Arrhenius (Out now on itch.io!)
Hey, #Sweden:
I made an #indie #rpg and named it after famous Swedeish scientist Svante Arrhenius.
You know who didn’t do that? Any Norwegians.
jesseharlin.itch.io/arrhenius
I made an #indie #rpg and named it after famous Swedeish scientist Svante Arrhenius.
You know who didn’t do that? Any Norwegians.
jesseharlin.itch.io/arrhenius
ARRHENIUS | An Icecore Roleplaying Game by Dungeonteller
A Far-Future Ice Age TTRPG Set in the Year 100,000
jesseharlin.itch.io
January 11, 2026 at 11:20 PM
Hey, #Sweden:
I made an #indie #rpg and named it after famous Swedeish scientist Svante Arrhenius.
You know who didn’t do that? Any Norwegians.
jesseharlin.itch.io/arrhenius
I made an #indie #rpg and named it after famous Swedeish scientist Svante Arrhenius.
You know who didn’t do that? Any Norwegians.
jesseharlin.itch.io/arrhenius
Reposted by Arrhenius (Out now on itch.io!)
Okay, 2 hours in and #OperationInternet is off more of a slow rolling start. No #Arrhenius sales yet, but the upside is that it means we have literally 100% of internet users still to tap into. According to statistica.com, that's over 6 billion people–so we should be good! Keep up the great work! 🤞🤞
I did the math:
If everyone who uses the internet just bought one copy of my book, then I could retire and make more #ttrpgs. And since I’m not an artist, that means I’d have to hire tons of artists. Which is what I want to do anyway.
It’s all win/win. I call it #OperationInternet.
If everyone who uses the internet just bought one copy of my book, then I could retire and make more #ttrpgs. And since I’m not an artist, that means I’d have to hire tons of artists. Which is what I want to do anyway.
It’s all win/win. I call it #OperationInternet.
ARRHENIUS | An Icecore Roleplaying Game by Dungeonteller
A Far-Future Ice Age TTRPG Set in the Year 100,000
jesseharlin.itch.io
January 11, 2026 at 11:48 PM
Okay, 2 hours in and #OperationInternet is off more of a slow rolling start. No #Arrhenius sales yet, but the upside is that it means we have literally 100% of internet users still to tap into. According to statistica.com, that's over 6 billion people–so we should be good! Keep up the great work! 🤞🤞
Hey, #Sweden:
I made an #indie #rpg and named it after famous Swedeish scientist Svante Arrhenius.
You know who didn’t do that? Any Norwegians.
jesseharlin.itch.io/arrhenius
I made an #indie #rpg and named it after famous Swedeish scientist Svante Arrhenius.
You know who didn’t do that? Any Norwegians.
jesseharlin.itch.io/arrhenius
ARRHENIUS | An Icecore Roleplaying Game by Dungeonteller
A Far-Future Ice Age TTRPG Set in the Year 100,000
jesseharlin.itch.io
January 11, 2026 at 11:20 PM
Hey, #Sweden:
I made an #indie #rpg and named it after famous Swedeish scientist Svante Arrhenius.
You know who didn’t do that? Any Norwegians.
jesseharlin.itch.io/arrhenius
I made an #indie #rpg and named it after famous Swedeish scientist Svante Arrhenius.
You know who didn’t do that? Any Norwegians.
jesseharlin.itch.io/arrhenius
Reposted by Arrhenius (Out now on itch.io!)
I did the math:
If everyone who uses the internet just bought one copy of my book, then I could retire and make more #ttrpgs. And since I’m not an artist, that means I’d have to hire tons of artists. Which is what I want to do anyway.
It’s all win/win. I call it #OperationInternet.
If everyone who uses the internet just bought one copy of my book, then I could retire and make more #ttrpgs. And since I’m not an artist, that means I’d have to hire tons of artists. Which is what I want to do anyway.
It’s all win/win. I call it #OperationInternet.
ARRHENIUS | An Icecore Roleplaying Game by Dungeonteller
A Far-Future Ice Age TTRPG Set in the Year 100,000
jesseharlin.itch.io
January 11, 2026 at 9:57 PM
I did the math:
If everyone who uses the internet just bought one copy of my book, then I could retire and make more #ttrpgs. And since I’m not an artist, that means I’d have to hire tons of artists. Which is what I want to do anyway.
It’s all win/win. I call it #OperationInternet.
If everyone who uses the internet just bought one copy of my book, then I could retire and make more #ttrpgs. And since I’m not an artist, that means I’d have to hire tons of artists. Which is what I want to do anyway.
It’s all win/win. I call it #OperationInternet.
Reposted by Arrhenius (Out now on itch.io!)
what u have to understand is that working on my novel, answering dms, and answering emails all cost 1 spell slot but posting? Posting is a cantrip
January 7, 2026 at 5:55 AM
what u have to understand is that working on my novel, answering dms, and answering emails all cost 1 spell slot but posting? Posting is a cantrip
Another sale of #Arrhenius over on itch means another free Community Copy available for those who can’t afford it.
Grab it while it’s available!
jesseharlin.itch.io
Grab it while it’s available!
jesseharlin.itch.io
Dungeonteller
jesseharlin.itch.io
January 4, 2026 at 6:09 PM
Another sale of #Arrhenius over on itch means another free Community Copy available for those who can’t afford it.
Grab it while it’s available!
jesseharlin.itch.io
Grab it while it’s available!
jesseharlin.itch.io
One more year closer to the Age of #Arrhenius! Only… (checks math) 97,974 more years to go!
It’s right around the corner!
It’s right around the corner!
January 3, 2026 at 5:00 AM
One more year closer to the Age of #Arrhenius! Only… (checks math) 97,974 more years to go!
It’s right around the corner!
It’s right around the corner!
Reposted by Arrhenius (Out now on itch.io!)
Open up this picture fully.
Then look at the surface of Mars.
Then look up to the top right.
Spot Mars' moon Phobos high in the sky.
Then notice the bright spot beside Phobos.
That's Earth.
Then look at the surface of Mars.
Then look up to the top right.
Spot Mars' moon Phobos high in the sky.
Then notice the bright spot beside Phobos.
That's Earth.
December 30, 2025 at 9:30 PM
Open up this picture fully.
Then look at the surface of Mars.
Then look up to the top right.
Spot Mars' moon Phobos high in the sky.
Then notice the bright spot beside Phobos.
That's Earth.
Then look at the surface of Mars.
Then look up to the top right.
Spot Mars' moon Phobos high in the sky.
Then notice the bright spot beside Phobos.
That's Earth.
Reposted by Arrhenius (Out now on itch.io!)
Jim Wampler announced this morning that we lost Tim Kask, who passed in his sleep on the 30th.
Tim was the creator of The Dragon, which set the foundation for what an industry-focused magazine should be. He was an icon and one of the few early founders of TSR still with us.
Tim was the creator of The Dragon, which set the foundation for what an industry-focused magazine should be. He was an icon and one of the few early founders of TSR still with us.
December 31, 2025 at 2:39 PM
Jim Wampler announced this morning that we lost Tim Kask, who passed in his sleep on the 30th.
Tim was the creator of The Dragon, which set the foundation for what an industry-focused magazine should be. He was an icon and one of the few early founders of TSR still with us.
Tim was the creator of The Dragon, which set the foundation for what an industry-focused magazine should be. He was an icon and one of the few early founders of TSR still with us.
Reposted by Arrhenius (Out now on itch.io!)
Happy New Year ❤️ Think this was my most popular piece of 2025! Wishing you all a Left Pic Jessica kind of 2026
December 31, 2025 at 7:38 PM
Happy New Year ❤️ Think this was my most popular piece of 2025! Wishing you all a Left Pic Jessica kind of 2026
Reposted by Arrhenius (Out now on itch.io!)
"The Human's world ends soon," said the cat.
"Again?" said the dog.
"They are fond of endings and beginnings. Even if nothing changes."
The dog whined.
"Same procedure as last year?" said the cat.
"Please."
The cat lay on the dog's head and purred, muffling the fireworks.
#CrossRepost
"Again?" said the dog.
"They are fond of endings and beginnings. Even if nothing changes."
The dog whined.
"Same procedure as last year?" said the cat.
"Please."
The cat lay on the dog's head and purred, muffling the fireworks.
#CrossRepost
December 31, 2025 at 7:15 PM
"The Human's world ends soon," said the cat.
"Again?" said the dog.
"They are fond of endings and beginnings. Even if nothing changes."
The dog whined.
"Same procedure as last year?" said the cat.
"Please."
The cat lay on the dog's head and purred, muffling the fireworks.
#CrossRepost
"Again?" said the dog.
"They are fond of endings and beginnings. Even if nothing changes."
The dog whined.
"Same procedure as last year?" said the cat.
"Please."
The cat lay on the dog's head and purred, muffling the fireworks.
#CrossRepost
Reposted by Arrhenius (Out now on itch.io!)
words for the new year
December 31, 2025 at 7:41 PM
words for the new year
Reposted by Arrhenius (Out now on itch.io!)
the haunting of hill house
December 31, 2025 at 7:43 PM
the haunting of hill house
“What was your biggest impact on the Internet?”
Probably creating Mando’a for #StarWars Republic Commando. Karen Traviss expanded it greatly, but it started with my music for SWRC.
starwars.fandom.com/wiki/Mando%2...
youtu.be/iiNyQD5Yq3E
Probably creating Mando’a for #StarWars Republic Commando. Karen Traviss expanded it greatly, but it started with my music for SWRC.
starwars.fandom.com/wiki/Mando%2...
youtu.be/iiNyQD5Yq3E
December 31, 2025 at 7:46 PM
“What was your biggest impact on the Internet?”
Probably creating Mando’a for #StarWars Republic Commando. Karen Traviss expanded it greatly, but it started with my music for SWRC.
starwars.fandom.com/wiki/Mando%2...
youtu.be/iiNyQD5Yq3E
Probably creating Mando’a for #StarWars Republic Commando. Karen Traviss expanded it greatly, but it started with my music for SWRC.
starwars.fandom.com/wiki/Mando%2...
youtu.be/iiNyQD5Yq3E
Every time my kid asks for string cheese, I always sing:
"YOU'RE OWN....
"PERSONAL......
"CHEESES......"
And he has never once appreciated it.
DOOM Dooba DOO BAH Doom ba-Dahbah DAH BAHM
"YOU'RE OWN....
"PERSONAL......
"CHEESES......"
And he has never once appreciated it.
DOOM Dooba DOO BAH Doom ba-Dahbah DAH BAHM
December 31, 2025 at 3:27 AM
Every time my kid asks for string cheese, I always sing:
"YOU'RE OWN....
"PERSONAL......
"CHEESES......"
And he has never once appreciated it.
DOOM Dooba DOO BAH Doom ba-Dahbah DAH BAHM
"YOU'RE OWN....
"PERSONAL......
"CHEESES......"
And he has never once appreciated it.
DOOM Dooba DOO BAH Doom ba-Dahbah DAH BAHM
Look out, Genius Bar. I’m bringing you a mess………. 🍏
December 30, 2025 at 7:19 PM
Look out, Genius Bar. I’m bringing you a mess………. 🍏
Reposted by Arrhenius (Out now on itch.io!)
Comfort and joy?! Bah, humbug.
Tis the season for frozen mutants!
The #Arrhenius #ttrpg comes complete w/snow, ice, hypothermia, and a free Quick Start demo available for download RIGHT NOW.
Right now! Can you believe your luck?!
All you need to do is add the dice 🎲
jesseharlin.itch.io/arrhenius
Tis the season for frozen mutants!
The #Arrhenius #ttrpg comes complete w/snow, ice, hypothermia, and a free Quick Start demo available for download RIGHT NOW.
Right now! Can you believe your luck?!
All you need to do is add the dice 🎲
jesseharlin.itch.io/arrhenius
December 22, 2025 at 8:46 PM
Comfort and joy?! Bah, humbug.
Tis the season for frozen mutants!
The #Arrhenius #ttrpg comes complete w/snow, ice, hypothermia, and a free Quick Start demo available for download RIGHT NOW.
Right now! Can you believe your luck?!
All you need to do is add the dice 🎲
jesseharlin.itch.io/arrhenius
Tis the season for frozen mutants!
The #Arrhenius #ttrpg comes complete w/snow, ice, hypothermia, and a free Quick Start demo available for download RIGHT NOW.
Right now! Can you believe your luck?!
All you need to do is add the dice 🎲
jesseharlin.itch.io/arrhenius
Reposted by Arrhenius (Out now on itch.io!)
Reposted by Arrhenius (Out now on itch.io!)
Show me what you can do with just a pen! (and pencil 😁)
December 27, 2025 at 12:28 AM
Show me what you can do with just a pen! (and pencil 😁)
Reposted by Arrhenius (Out now on itch.io!)
December 18, 2025 at 12:48 AM