Form VIII: Juyo/Vaapad (Powerstaark)

Juyo and Vaapad, both of which were known as "the way of the Vornskr' or 'the ferocity form' were vicious styles of lightsaber combat. Juyo and Vaapad were very similar and therefore they were combined into one form

Juyo

Juyo was a vicious fighting style where the user would call on their rage, focusing it into their attacks to overwhelm their opponents. However the Juyo practitioner had to be careful to not let their rage distract them and force them to make mistakes. Because a Juyo practitioner had to call on their rage very few Jedi use it though it was a common style for Sith Lords.

Vaapad

Vaapad was more than a fighting style; it was a state of mind. A practitioner of Vaapad would draw on their inner darkness and the darkness of the opponent and focus it into a positive force to serve the Light side of the force. To become a master of Vaapad the user had to be strong willed and able to resist the pull of the Dark side. They had to relish the fight and enjoy the satisfaction of winning but at the same time they had to hold onto the Light side and make sure they controlled Vaapad and Vaapad didn't control them.

Stance and maneuvers
Both Vaapad and Juyo employed the same opening stance; the user would hold the hilt of their lightsaber close to the body with both hands with the tip pointed at the opponent. Their body would lean slightly to one side and from this position they could attack with a powerful stab known as "Shiak". Shiak was any kind of stab not just this one. A master of Juyo or Vaapad could look as though they're weilding several lightsabers at once, using the Force to speed up their maneuvers.

Practitioners
Juyo

Darth Sidious was a true master of Juyo, using his rage to fuel his incredible power. He combined it with other fighting styles making him an almost unstoppable opponent. He also trained his first apprentice, Darth Maul to use Juyo and Maul also mastered the style. Sidious' third apprentice, Darth Vader, put elements of Juyo into his fighting style.

General Grievous was a practitioner of Juyo, and his cyborg body gave him devastating speed and his vicious temper contributed to his power. Asajj Ventress was also a practitioner of the Jar'Kai variant of Juyo.

Very few Jedi practiced Juyo but notable exceptions were Rahm Kota, Even Peill and Mace Windu. Mace realised that Juyo was too dangerous for him to use and therefore he created Vaapad to replace it.

Vaapad

Only one Jedi has been confirmed to have truly mastered Vaapad; Mace Windu. Mace's skill with the style made him virtually undefeatable and he even managed to defeat Darth Sidious, a feat that even Yoda had been unable to accomplish. Mace also trained his Padawan Depa Billaba to use Vaapad but Depa eventually succumbed to the dark side.

Sora Bulq was a practitioner of Vaapad but like Depa he submitted to the Dark side. Vaapad was Bulq's preferred form and he combined it with Jar'Kai by using a Shoto. Sora taught Quinlan Vos a few maneuvers from Vaapad but although Quinlan succumbed to the Dark side for a time he eventually managed to redeem himself.