Gnosis characters are defined by Abilities (Strength, Dexterity, Constitution, Intelligence, Wisdom, and Charisma). In addition, characters may obtain Training, which grants specific game bonuses (for example, "Medicine: When you heal, also heal +2 LP; perform Surgery in half the time"). Characters also know and can learn Tricks which generally provide specific situational bonuses (for example, "Occult Knowledge: Half Sanity damage from studying artifacts").
The rules present a focus on combat, and various options are noted and defined. Action resolution, including combat, uses a traditional modified die roll compared to an opponent's modified die roll or a GM-assigned static target. The genre presents an eclectic mix of modern urban fantasy with horror elements.
The quickstart document described here is marketed as a "preview" version of the game, and the cover image states "Core Rules".