Fluxus is a popular exploit for Roblox, typically used for running scripts and modifying gameplay. However, it's important to note that using such exploits violates Roblox's terms of service and can lead to your account being permanently banned.
If you're looking to enhance your Roblox experience, consider focusing on learning game development or scripting within the official boundaries set by Roblox. There are many resources available for creating your own games and enjoying Roblox as it was intended.