Every weapon, trinket, passive and affix in the game, with all their numbers.
Edit them, or add your own. Behaviour (kind, use,
proc) has to name an effect the engine already implements: a new
trinket is a new shape of an existing one, which is what makes it safe
to accept submissions.
These write straight into the live game. Start a match and they apply. Save on this device keeps them in this browser only. Download config.json gives you the baked config: drop it next to the game’s HTML and commit it, and it’s fixed for everyone until you replace it.