Super Saiyan 2 is an upgraded version of regular Super Saiyan. In order to achieve this transformation, the Saiyan must first gain a huge amount of energy (usually by training), far beyond that required for the first Super Saiyan form. Once enough energy is acquired, the saiyan must experience a powerful emotional upheaval, much like the Super Saiyan transformation, but to a greater extent. Because of the intense emotion required to initiate the transformation, any mastery of the Full-Power Super Saiyan state, and mental stability attained there in is negated and the naturally remorseless nature of the Saiyan race is magnified, requiring them to remaster the personaltiy changes. Even the gentle, polite Gohan became a hotheaded, merciless fighter after transforming, opting to torture Cell rather than kill him despite Goku's pleas. The power output emitted by this form is greatly increased as well, as it doubles the strength of the regular Super Saiyan transformation, as stated by the Super perfect guide.