Something I’ve been meaning to do for a while now is create some guidelines for converting adventures to the Tiny d10 system. Well, I finally got around to that! Below I present a very preliminary guide to converting d20 System-based adventures (and sort-of other systems too). You can find the PDF here.
Contained herein are loose guidelines to aid game masters in the conversion of adventures and content into content that is compatible with Tiny d10. As you use this material, keep in mind the Golden Rule of Conversion: Convert only what is necessary. Published adventures often work best as sources of inspiration and guidance, and need not be strictly adhered to. Often times, simply carving out the “physical” components of the adventure is sufficient for conversion.
Monster conversion is drastically simplified by the use of the d20 System concept of challenge rating (CR).
|CR||Toughness||Average Monster Statistics|
|0-1||Simple Toughness||T2-T6; 2-6 HP; ST monsters sometimes have attribute bonuses, abilities, or skills.|
|2-9||Moderate Toughness||T7-T8; 7-15 HP; MT monsters sometimes have attribute bonuses, abilities, and skills.|
|10-16||Difficult Toughness||T9-T10; 10-20 HP; DT monsters often have attribute bonuses, abilities, and skills.|
|17-22||Extreme Toughness||T11-T13; 15-30 HP; ET monsters often have attribute bonuses, abilities, and skills.|
|23-30||Impossible Toughness||T14-15+; 20-40+ HP; IT monsters always have attribute bonuses, abilities, and skills.|
If you are not converting from the d20 System, use Tiny d10’s standard monster toughness table for quick conversion. Additionally, game masters may substitute unconverted monsters for existing ones, using creatures consistent with the adventure’s location and theme.
Experience Points and Treasure
It is not necessary to convert experience points (XP) – instead, they can be awarded as per the core rules. Treasures should first be converted to USD, then to TD10 values. For a d20 System-based economy, it is assumed that the value of 1 gold piece is equal to $100.
|1 gold piece (gp) = $10 USD||1 silver piece (sp) = $5 USD||1 copper piece (cp) = $1 USD|
The difficulty of a combat encounter is generally determined by the number of monsters and the toughness of each monster that the party is facing. An encounter in the d20 System is designed around the level(s) of the characters involved. For this reason, when encounters are converted to TD10, character level should be a primary consideration. To scale encounters, consider level equivalency:
|d20 Character Level||TD10 Character Level|
|Levels 1 to 4||Level 1 (Explorer)|
|Levels 5 to 8||Level 2 (Adventurer)|
|Levels 9 to 12||Level 3 (Hero)|
|Levels 13 to 16||Level 4 (Champion)|
|Levels 17 to 20||Level 5 (Legend)|
Once the encounter level is scaled, monsters can be converted/substituted, typically on a 1:1 basis.
Any conversions not specifically covered in this document can be addressed generally using the d20 System concept of difficulty class (DC). Much like check toughness, DC represents how difficult it is to succeed an action.
|Difficulty Class (DC)||Toughness|
|0-5 (Easy)||T2-T6 (Simple)|
|10 (Average)||T7-T8 (Moderate)|
|15 (Tough)||T9 (Difficult)|
|20 (Challenging)||T10 (Difficult)|
|25 (Formidable)||T11-T12 (Extreme)|
|30 (Heroic)||T13-T14 (Nigh impossible)|
|40 (Nigh impossible)||T15 (Impossible)|
If you are not converting from the d20 System, use Tiny d10’s standard check toughness table for quick conversion.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 United States License.
All ‘d20 System’ content used in compliance with the terms of the ‘d20 System’ Open Gaming License (OGL) v1.0a.
Finally, if you’re still following along, one more thing! I whipped up a quick PocketMod for the Tiny d10: High Fantasy core rules, thinking it might be useful for those who want to play on the go: hiking, camping, road-tripping, and anything in between. You can find that here, and folding instructions here. It’s not quite finished, of course – I’m still trying to pare the rules down even further (it’s already sub-1k words) in order to fit a micro-character sheet on there, but doing so is quite the challenge. We’ll see how it goes.
In the meantime, let me know if there’s anything you’d like to see added to the Adventure Conversion Guide!