Super Saiyan 2

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Super Saiyan 2 is the second Saiyan transformation you will get. You must defeat any of the Mechanical Bosses. Afterward, dying to any boss while in a mastered Super Saiyan 1 form will unleash your Super Saiyan 2 form. ====== Your damage and speed get increased by 125% and you gain 62.5% more damage for non-Ki weapons, while in this form; but, on the downside, your Ki is drained at the rate of -120Ki/s and you lose 62.5% more Ki per attack. Once mastered, the form drains your Ki at a rate of -60Ki/s. While in Super Saiyan 2, your hair becomes much spikier than Super Saiyan 1, and you gain a larger aura and blue lightning that encircles your body.

See Mastery.

Trivia

 * This form was first unlocked by Teen Gohan in the Cell Games.
 * It highly resembles regular Super Saiyan, with the only difference being a spikier hair and lightning.