The d20 system, developed alongside D&D 3e, forms the mechanical backbone for a variety of RPG's entirely departed from the D&D system.

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What do books have over the SRD? [duplicate]

I've recently learned that many d20 games have their rules accessible for free under OGL in form of a System Reference Document. I'd been quite reluctant to d20, but since it's free, I've thought of ...
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What is “the d20 bust,” and what does “post-d20 game” mean?

Reading this gaming industry retrospective I ran into a few phrases which confused me. The d20 bust caused by 3.5e (2003) and the over-saturation of d20 products ran right into the Great ...
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Most faithful way to convert a d20 base roll to a d6 base roll?

I'm semi-converting an old adventure from DnD 3.X to d6 Fantasy, but I'm having trouble getting a roll conversion that I am happy with. The adventure calls for an extended test of d20 +X rolls until ...
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Recommend me an investigative adventure set in the wilderness

For my next session in my campaign, I plan to have the party to track the villain from point A to point B, while following a trail of "breadcrumbs", clues left behind by the villain. Perhaps at each ...
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Which module features an undead pirate fleet waiting to attack a town?

I came across an online review/synopsis of this d20/Pathfinder module but for the life of me I can't remember its name now. Here is the premise: It's an urban adventure, set in a rather large port ...
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Where can I find a lot of d20 Modern mods?

There's a huge number of games that use the d20 System, including d20 Modern. I've been looking for mods that adapt d20 Modern, or just the d20 System in general. I feel there must be a list somewhere ...
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Does a natural 20 initiative roll have any special rules?

I rolled a 20 for initiative in a pickup game today and I realized that I didn't know if that was supposed to be treated specially, like some other rolls treat a natural 20. Does rolling a natural 20 ...
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Running a game with intentionally “over-powered” PCs

I've been playing for a few years now (I know I'm green) but I've been planning on running a game with intentionally "Over-Powered" PCs. This is the style of play I would like to try: My idea is to ...
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Cthulhu in D&D 3.5

I am planning a campaign arc where the antagonists are followers of the entity known as Cthulhu from H.P Lovecraft's strange tales. In the end of the campaign I'd like to have the adventurers fight ...
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Total or partial removal of skill cap in d20

What effect would removing or partially removing the skill cap in the d20 system (with a focus on DnD3.5 and Cthulhu d20)? By partial removal I mean - for example - (handing out all the skill points ...
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d20 source books for modern/futuristic settings [closed]

I'm planning a game where different characters come from different time periods and cultures, and I'm using different source books to provide different rules for each character. The general idea is we ...
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What are the key mechanical gotchas when moving from d20 SRD to Legend?

As everybody knows, once you've learned to do something one way it is very hard to unlearn. This is easier when it comes to the big things like character creation but harder in the heat of combat. ...
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How to roll perception checks for characters who aren't actively looking?

This applies to all d20 systems, but with an example from the from the Pathfinder PRD (emphasis mine): Stonecunning: Dwarves receive a +2 bonus on Perception checks to potentially notice unusual ...
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967 views

Does anyone know of a D20 system that uses the Harry Potter Universe?

Does anyone know of a D20 system that uses the Harry Potter Universe? I want to try something new with a few of my friends. We really want to try and get away from the usual D&D for a bit and try ...
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810 views

How do I implement Social Combat into a D&D/D20/Pathfinder game?

One of the coolest parts of White-Wolf games, in my opinion, is that they usually offer the ability for Social Combat to be just as exciting as physical or mental combat. How can I run Social Combat ...
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279 views

How can I balance an encounter with reinforcements?

I've been planning encounters that come in two parts or have reinforcements recently, and it occurs to me that reinforcements don't have the same effect on an encounter as if they were there from the ...
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Which games have been based off/derived from the Anime d20 SRD?

The Anime d20 SRD brought some interesting changes to the original 3e d20 SRD. Aside from BESM d20, which obviously isn't a derivative of itself, which games have made use of the Anime d20 SRD - in ...
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A campaign based on a novel: Let the plot deviate or make the PCs' thread unrelated?

I want to start a Game of Thrones (d20) campaign. My idea is based on the first book of seven (which comprises the whole story). I don't want to change the course of the novel, but if my PCs are ...
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What differences are there between Prime Directive d20 and Prime Directive d20 Modern?

There are 2 versions of Prime Directive d20, one based on the D&D 3.5 PHB and the other based on D20 Modern. Are there any noteworthy differences between the two versions, or did they just make a ...
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How do I quicken / sum up larger (but not army-scale) d20/DnD3.x combat?

I'll be rather specific: Imagine you have five lv7 characters (in DnD3.5), a bunch of their followers (skeletons raised by their priestess and whatnot), and they're facing about the same number of ...
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Game of Thrones d20 Cooperative?

Devir presents a d20 setting of Game of Thrones, prestigious river novel of George RR Martin, with low magic and a lot of Treason and Plot (but without the gunpowder, lol). Anyway.. One of the game ...
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What are the ramifications of replacing a square based combat grid with a hex based one?

I have a personal preference for hexes over squares - the latter present some problems in terms of diagonal movement, and aliasing for certain area effects, that are just handled better with hexes. ...
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What are some quality low-magic d20 (3.5e/PF) systems?

The title pretty much says it all. I'm getting ready to run a very low-magic (but high martial combat/adventure) Pathfinder campaign, and am looking for any systems to draw mechanics and inspiration ...
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In XCrawl, does grandstanding have any short term effects?

In XCrawl, you can grandstand to the crowd or mug for the camera during a dungeon crawl. There are a lot of rules around that - Perform skills, etc - but it seems like the only effect I can find is a ...
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7answers
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How do you tell if a D&D book is 3.0 or 3.5?

I'm new to d20. I recently acquired a bunch of D&D books and I'm sure they are all either 3.0 or 3.5, but it doesn't say in the book which version it is. How can I tell which version the book is? ...
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Which version of d20 is World of Warcraft RPG compatible with?

I picked up the WoW RPG a few years back before I knew anything about D&D/d20 and am just now getting around to checking out D&D and am wondering where this book fits into the d20 versions?
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Any good steampunk material for d20?

The DM of my current Friday night game is running a steampunk-setting, using the Pathfinder rules system. We have two artificers in the party, but my feeling is that all of our material is fantasy and ...