Darth Midous' first lightsaber

"This weapon was once used to serve the Jedi Order, but as you devote your life to the dark side of the Force, it will soon become a powerful weapon of the Sith."

- Darth Tyranus, to Darth Midous

Darth Midous' first lightsaber, formerly known as Joul Fontaine's lightsaber, was a lightsaber constructed by Joul Fontaine that he used during his Jedi training and after his fall to the dark side. As an initiate of the Jedi Order, Fontaine built the lightsaber and used it during his training to become a Jedi. In 26 BBY, Fontaine used the lightsaber to fight beside his Jedi Master, Garid Du'Ques, in the planetary gang war on his homeworld of Corellia. After discovering the location of his captive mother, Fontaine and Du'Ques confronted the Sith Lord Darth Tyranus, who had kidnapped Jinora Fontaine. After defeating the Jedi in a lightsaber duel, Tyranus kept Fontaine's lightsaber and returned it after he fell to the dark side, pledging his allegiance to Tyranus. As a Sith apprentice, Darth Midous bled the saber's kyber crystal and turned it red, devoting his life to the Sith.

Description
Like every lightsaber of the Jedi Order, Joul Fontaine's lightsaber was powered by a kyber crystal in the core of the hilt. It emitted a blue, high-energy, plasma blade that turned red after Fontaine fell to the dark side of the Force. The hilt was twenty-eight centimeters long, cylindrical in shape, and made of alloy metal. In addition to the crystal, the lightsaber also contained other components such as a diatium power cell at the base of the hilt, a ring tuning flange, and a magnetic stabilizing ring and emitter.

Joul Fontaine's lightsaber
As an initiate of the Jedi Order, Joul Fontaine constructed his lightsaber during his early years.