Rob Koska - Revenge of the Firstborn
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Rob Koska - Revenge of the Firstborn
@rob-in-mn.bsky.social
Game Designer and software engineer. Creating Revenge of the Firstborn, a turn-based RPG inspired by the classics like SSI's gold box games, and Baldur's Gate.
wishlist at https://cutt.ly/ve7SRGjZ
Thanks for hosting #TurnBasedThursday!

This week, I've done a write up of the crafting system for Revenge of the Firstborn. It's a very accurate implementation of the 3.5 SRD's crafting system. You check out the writeup at tinyurl.com/4xuwr6xh
Revenge of the Firstborn - Revenge of the Firstborn's Crafting System - Steam News
Learn about how item creation works in Revenge of the Firstborn's implementation of the 3.5 SRD's crafting feats.
tinyurl.com
August 29, 2025 at 5:39 AM
Thanks for hosting this week's #turnBasedThursday!

This week, I created a video going over the major features of the Druid class in Revenge of the Firstborn. You can check it out at rb.gy/ucj6o4
Revenge of the Firstborn Druid Overview
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
rb.gy
July 31, 2025 at 9:11 PM
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Revenge of the Firstborn is an incredibly accurate implementation of the 3.5 SRD rules. Sporting every feat from the P&P rules, along with 125 unique monsters and over 275 accurately implemented spells!
July 18, 2025 at 2:27 AM
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This week I'm excited to share some of the art my 2d artist has been cooking up for monster portraits in Revenge of the Firstborn. Check out a little time lapse of his process below!

www.youtube.com/shorts/6pfyl...
WIP for a monster portrait! check the game's channel: @RotFB #rpg #timelapsedrawing #wip
YouTube video by Lizard Soup TV
www.youtube.com
June 19, 2025 at 7:17 PM
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I'm excited to announce that beta testing is beginning this weekend for Revenge of the Firstborn.
You can sign up as a beta tester by joining the mailing list at www.revengeofthefirstborn.com
Revenge of the Firstborn | a classics-inspired computer roleplaying game based on the OGL 3.5 rules
Revenge of the First Born - a turn-based computer roleplaying game based on the OGL 3.5 ruleset and inspired by the classics of the genre such as Baldur's Gate 3, Temple of Elemental Evil and the AD&D...
www.revengeofthefirstborn.com
May 29, 2025 at 11:52 PM
This week, I've made a post about Revenge of the Firstborn's roguelike mode - the Endless Dungeon.
#turnBasedThursday

store.steampowered.com/news/app/342...
Revenge of the Firstborn - Exploring the Endless Dungeon - Steam News
Revenge of the Firstborn contains two game modes, an epic campaign and a roguelike mode. Let's explore roguelike mode, The Endless Dungeon.
store.steampowered.com
May 23, 2025 at 2:03 AM
Hopefully you’ve found this little peek under the hood of the engine interesting. Keep an eye out for more details in future updates!
April 19, 2025 at 11:44 PM
Similarly, grappling is more likely if the agent is clearly stronger (a very large difference in strength score) and if the target is a spellcaster who would be largely neutralized by being unable to freely move their limbs.
April 19, 2025 at 11:44 PM
The game uses a similar scoring system for what type of an attack an agent should make. For instance, a trip attack gets a higher score if the agent is bigger than its target and it has the Improved Trip feat.
April 19, 2025 at 11:44 PM
For instance, average intelligence creatures are smart enough to attempt to flank you in combat, but non-intelligent ones are not. Creatures can also add new actions to the baseline collection. For example, the medusa has an addition action for using its petrifying gaze attack.
April 19, 2025 at 11:44 PM
The game has several baseline utility action collections – it has one for average intelligence agents, non-intelligent agents (undead) and even a few specific ones such as dragons. This helps give agents different behaviors as appropriate.
April 19, 2025 at 11:44 PM
So, we are left with the following utility scores:
• Use Healing Potion – 25
• Attack Enemy – 10
• Run Away in Fear – 75
Making the clear winner Run Away in Fear. The actor will attempt to find a place that is far away from the source of its fear and run to that location.
April 19, 2025 at 11:44 PM
However, the ai actor has a fear effect. The fear effect has a very high utility score because fear supersedes any other actions the agent could take. The Run Away in Fear action has a score of 75.
April 19, 2025 at 11:44 PM
Let’s say that our hypothetical agent has a potion, is low on health and is not in danger. This would make our Use Potion utility have a final score of 25.
We don’t have any enemies close by, so the attack utility is low, perhaps 10.
April 19, 2025 at 11:44 PM
Lastly, is the agent close enough to an enemy that the enemy can make an attack of opportunity on them if they drink a potion? If so, we reduce the score by 10. This would make the action’s final score 15, meaning it is less likely to be chosen, but not impossible to be chosen.
April 19, 2025 at 11:44 PM