On the icy planet of Ilum, inside a sacred Jedi site, Jedi Master Luminara Unduli is supervising the ritual creation of a lightsaber by her Padawan, Barriss Offee. Using crystals from the cave, Barriss finalizes her lightsaber, sealing the completed device up.
As Offee constructs her lightsaber, Unduli recites a ritualistic incantation which she tells her padawan that she must never forget:
The crystal is the heart of the blade.
The heart is the crystal of the Jedi.
The Jedi is the crystal of the Force.
The Force is the blade of the heart.
Unduli concludes by saying that, “All are intertwined: the crystal, the blade, the Jedi. You are one,” and then she congratulates her Padawan for completing her training. Offee’s exultation is short lived, however, as Luminara, through the Force, senses something is amiss. Cloaked Separatist chameleon droids have infiltrated the cave, in an attempt to destroy a site necessary for the Jedi war effort.
Although they manage to stop the droids from entering the crystal-laden part of the cave, the Jedi precipitate a cave-in, sealing themselves inside. However, help is nearby—Yoda, near Ilum on the royal yacht of Padmé Amidala, feels them through the Force, and states that they must go to Ilum to save the Jedi.