If you are looking to simplify your gameplay in Flyff Universe
Assassins (Jester/Blade) rely on critical hits and attack speed. The faster you click, the more damage you deal. Human reflexes cap out at roughly 8-10 clicks per second (CPS). An auto clicker can hit 30+ CPS, drastically increasing your DPS (Damage Per Second).
A lightweight, open-source classic that's easy to set up for simple tasks.