At the beginning of every game, you will get one piece Brightcore. If you go to the blue icon on the minimap, you can spend your Brightcore, and you will get a random lightsaber with different chances.
Blue Lightsaber: 50%
Green Lightsaber: 50%
Red Lightsaber: 10%
Purple Lightsaber: 4%
Luke's Blue Lightsaber: 1.01%
You can also get Brightcore from Stashes around the island.
