This tool is an Autologin Launcher for "Tera".
It launches the client, enters your password and skips all the intros for you.
Plus it also kills unneeded background processes of the game to get additional performance.
When you launch the tool for the first time it prompts you to enter your email and password.
Your credentials will be stored in your game root directory called "Launcher.dat"
It will contain your email and your encrypted password, so don't worry, no one will be able to find it out.