Sidious isn’t going to just give Vader a new lightsaber, though. His aide Mas Amedda publicly burns all the Jedi’s recovered lightsabers in a furnace, signaling the Order is extinct. To get a new lightsaber, Vader will have to kill a Jedi and take theirs. The problem is that Order 66 just annihilated most of them, so Vader looks over a list of suspected survivors.
He selects Master Kirak Infil’a, a Jedi on a pilgrimage; since he wasn’t fighting alongside Clone Troopers, he was spared execution by them. Infil’a is an alien of an unnamed species but looks like a grey-skinned human. He also forgoes a shirt, showing a prominent X-shaped scar on his torso. Having taken the “Barash” vow of solitude, Infil’a spends his time on the moon Al’doleem, meditating and sparring with his training droid Arex. Infil’a wields a green lightsaber, which is what Vader wants.
Infil’a defeats Vader in their first battle (depicted in issue #3). Vader steals a training weapon from Arex and duels Infil’a on a dam in front of an Al’doleem city. The Jedi Master, having sensed his brethren’s massacre and eager to destroy the “monster” who helped kill them, sends Vader plummeting with the Force.
Unfortunately, Vader lands right near the damaged Arex and repairs his own cybernetics with the droid’s body (in the following issue #4). He comes back for round two, this time distracting Infil’a by shattering the dam and flooding the city. Infil’a offers his life and lightsaber for the city; Vader just takes them all.
Later in the series, the hilt on Vader’s stolen saber is damaged, so he replaces it with a new design — the one from the original “Star Wars” trilogy (that more closely resembles the one he had as Anakin).