Fusing deviations in Once Human requires planning and calculation. Registering an account is completely optional, but provides full personalization.
You can access the full Once Fusion database and use the simulator completely free without an account. Simply click the "Use guest instead" button in either panel. Guest accounts has one hour of inactivity timeout before it is removed.
Registering allows you to save your Deviation inventory, save simulated fusion runs, and log details of your actual in-game fusions across different devices. This also helps me collect the fusion data results for accurate probabilities from the game.
I have no need of informations from users. So just make sure to your your username and temporary password. Make sure to remember your password and username or just save it on your browser as there's no function for resetting passwords.
Browse complete data for deviations, traits, mutagen options, and skills.