Lyoon

Lyoon was a famous Jedi Master and Daymon Thorn's teacher. While traveling through space, the two Jedi became trapped aboard the Gorgorror, a biotechnological ship that captured other ships in order to sustain itself. They eventually joined forces with fellow trapped survivors Yele l'Ecumeuse and Brother Suunfuus to attempt to escape from the ship. Deep into the hull of the ship, the group found a chamber full of large crystals called Korendums. The power of the crystal tempted Thorn, which caused him to fall to the dark side of the Force and kill Lyoon. The three remaining survivors each took a crystal and escaped the ship.

After his death, Lyoon resided on the Gorgorror as a Force ghost. He came to learn of Thorn's plan to steal the other two Korendums to be used in a weapon. A group of Rebels who sought Suunfuus and his crystal, the last crystal Thorn needed, were captured by the Gorgorror. It was there that they met the once famous Jedi Master Lyoon who told them what had happened to him on the ship. The Jedi Master bestowed upon the Rebels an anti Korendum, which could dissipate the energy of a Korendum, and his lightsaber. He then sent them forth to escape the Gorgorror and stop Thorn from obtaining the last Korendum.

Text and facts from the “Lyoon” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.