Free · No sign-up · System-generic
Sinister 6: villains and fair fights, fast
Sinister 6 is a free toolkit for tabletop RPG Game Masters: instant villain, NPC, and encounter generators plus practical guides for running memorable D&D and Pathfinder games.
Vaness Corryn, the Hollow Magistrate
Three generators, one job: get you back to the table
Each tool rolls in one tap and gives you the part of prep that actually shapes a scene. Pick one and start.
Villain Generator
Roll an antagonist with a want, a wound, and a line they will not cross. You get a scheming person the party can argue with, not a stat block.
Forge a villainNPC Generator
One want, one quirk, one voice cue. Enough to run the tavernkeeper, the fence, or the nervous guard the second a player talks to them.
Roll an NPCEncounter Builder
Set party size and difficulty, get a fight tuned by action economy and terrain, plus an escape valve so a hard scene never turns into a stalemate.
Build a fightStart here: field notes for real play
The generators do the rolling. These guides explain the heuristics behind them, so the output holds up once the players start pushing back.
A motive you can say in one line
Pin the want, the wound, and the line the villain will not cross, and the antagonist runs itself at the table.
Read the guideBalance a fight by feel, then check the math
Encounter math gets you close. Action economy, terrain, and an escape valve decide whether the fight actually feels fair.
Read the guideImprovise NPCs players remember
You do not need a backstory to make a walk-on stick. One want, one quirk, and one voice cue is enough to run anyone on the fly.
Read the guideWant the full shelf? Browse every guide in Resources.
Why Sinister 6
Most prep tools bury you in options an hour before the session. Sinister 6 is built for the ten seconds between a player asking a question and you needing an answer.
Built for the table, not the binder
Mobile-first and one-tap fast. Roll it in your lap while the party debates their next move, read three lines, and keep the scene moving.
System-generic on purpose
You get motives, characters, and encounter shape, never a copied stat block. Slot the result into D&D, Pathfinder, or your homebrew and use the numbers you already trust.
Everything runs in your browser
No account, no backend, no data leaving the page. The generators are client-side only, so they keep working even when the game-store wifi does not.
Heuristics from real sessions
The tools encode the same shortcuts experienced GMs use to improvise: want and wound for people, action economy and terrain for fights. No filler, no lore dumps.
Frequently asked questions
Is Sinister 6 free?
Yes. Every generator and guide on this site is free to use, with no account, no sign-up, and no paywall. The tools run entirely in your browser.
Does it work with D&D and Pathfinder?
Yes. Sinister 6 is system-generic on purpose. It hands you characters, motives, and encounter shape rather than copyrighted stat blocks, so the output drops into Dungeons & Dragons, Pathfinder, or your own homebrew without a rules argument.
Do the generators need an internet connection or an account?
No account, ever. The generators are client-side JavaScript with no backend and no external calls, so once the page loads they keep working even if your connection drops, and nothing you roll leaves your device.
What is the fastest way to build a villain mid-session?
Open the villain generator, roll once, and keep the three lines that matter: the want, the wound, and the line the villain will not cross. That is enough to voice the antagonist and improvise their next move. The villain guide covers how to push it further after the session.
How is this different from a random name generator?
A name is the easy part. Sinister 6 gives you the parts that make a scene land: a motive, the leverage a character holds, and a fight tuned to your table. You can rename anything in a second, but you cannot fake a reason for the villain to be in the room.
Can I use what I generate in my own game?
Yes. The output is generic prompts and scaffolding meant to be rewritten into your campaign. Take the pieces that fit, change what does not, and run it at your table.