The TFV12 Beast King is the current vapor production king on the market. The TFV12 can run at 300W (!) of power, this is due to be able to house 12 coils in one coil head. The TFV12 is top-fill, and 25mm in diameter making it a large tank with ample capacity at 6ml. Most coils start at 60W minimum power needed, so a good powerful device is necessary for the Beast King.
The Beast King has a lot of airflow, necessary for cooling the vapor down when operating at higher wattages. This is definitely a tank for experienced vapers who want to produce massive clouds with rich flavour.