After walking inside the cave for about twenty minutes, Jyn comes to a small, underground lake.
I know that I must go this way, but the path ends here! What now? Jyn thinks.
"Patience, Thana. Listen." Abeloth's disembodied voice says.
"Very well." Jyn says. Jyn closes her eyes, and concentrates on the crystal's song.
I know exactly where it is. I have to go...down. Into the lake! Jyn thinks.
"You listen well. We will speak again when you reach the crystal." Abeloth says.
Looks like I'm swimming. I'll have to leave behind anything that I don't want to get wet. Jyn thinks.
Jyn takes off her jacket, boots, comlink, and gun belt. Then, she takes a deep breath, and dives into the lake.
Once underwater, Jyn uses the force to swim much faster than normal. She is also able to hold her breath for much longer than non force users.
Ten minutes later, Jyn emerges from the lake, and finds herself in a small, isolated chamber. The room is empty, save for a short, stone pedestal, with a glowing, yellow crystal sitting on top of it.
There you are at last! The song is so clear now! I also feel...warmer. Jyn thinks. She walks closer to the crystal.
Interesting. Now, I feel even warmer. It must be the crystal. Jyn thinks.
"Indeed, Thana. Now, I must warn you. The crystal will attempt to destroy you once you touch it. You must assert your will over it. Similar to how a sith bleeds a kyber crystal for their lightsaber." Abeloth says.
"I bled my first kyber crystal when I was only twelve years old! This will be child's play!" Jyn says.
"Overconfidence doesn't suit you, Thana. It will be your master's downfall after all." Abeloth says. Jyn considers the words of her guide for several seconds.
"Point taken. I will be careful." Jyn says.
"Then, I leave you to your task." Abeloth says.
Jyn slowly approaches the crystal, and stops within a foot of it.
"Damn! It's hot as Mustafar! Is this crystal really giving off that much heat?" Jyn asks.
"It is a defense mechanism. Designed to weed out the unworthy. Many would have given up by now. You are the first in centuries to attempt to acquire the crystal of knowledge." Abeloth answers.
"Are all the crystals like this?" Jyn asks.
"No. Only the crystal of knowledge possesses such a defense. Each crystal possesses its own unique ability to protect itself from the unworthy." Abeloth answers.
"Interesting. Now, let's get this over with!" Jyn says.
Jyn cautiously reaches for the crystal, despite the increasing heat. As she touches it, Jyn feels a great burning sensation.
"Aargh!" Jyn screams.
Pain is only of the flesh. I am the master of my flesh. It will serve my will. Jyn thinks.
Jyn tightens her grip on the crystal, and removes it from the pedestal. The crystal starts to glow brighter, and begins to discharge energy randomly. Some of the discharge hits Jyn, and she falls to the ground, in great pain. The discharge begins to burn her body.
"Aargh!" Jyn shouts. The energy continues to attack her.
This damn crystal is killing me! Just like she said! I need to focus! Force the crystal to serve my will! Jyn thinks. She concentrates as the crystal continues to attack her, leaving her with numerous small burns on her skin.
I am Darth Thana, lord of the Sith! You will serve me! I am your master! Jyn thinks.
Jyn is suddenly enveloped in a bright, yellow light, which lasts for a minute before dissipating, and leaving Jyn uninjured, with a harmless, yellow kyber crystal in her hand.
The crystal is no longer attacking me! My burns are healed? I feel no pain at all. I feel...strange. I feel...stronger. Jyn thinks. She stands up.
"Yes, Thana. The power of the crystal is yours." Abeloth says.
"One down, four to go." Jyn says.
"Then what?" Ezra's disembodied voice says.
"Bridger! What is this? How can this be?" Jyn asks.
"He speaks to you from beyond. He can do nothing to you." Abeloth says.
"A force spirit? I've heard the legends. Never believed them." Jyn says.
"Force spirits are no legend, Thana. Be cautious. He will try to sway you with his Jedi lies." Abeloth says.
"So, Abeloth in your head. That's got to be a pain in the ass." Ezra says.
"What do you know of Abeloth?" Jyn asks.
"More than you." Ezra answers.
"She has been a guide to me. She has shown me my true path. Now, why are you here? I distinctly remember killing you." Jyn says.
"Did you now? Or did the force make it appear that way?" Ezra asks.
"I. Killed. You. Jedi." Jyn says.
"Perhaps. Perhaps not. The future is always in motion." Ezra says.
"Pointless riddles. You're a Jedi alright." Jyn says.
"Back to my first question. Once you have all five crystals, what's next for Darth Thana?" Ezra asks.
"I will take my rightful place as empress, and bring peace and order to the galaxy." Jyn answers.
"Sounds so simple. Why didn't I think of that?" Ezra asks.
"Now you mock me." Jyn says.
"I can keep this up all day, Erso." Ezra says.
"You call me by my false name as well." Jyn says.
"No, your true name is Jyn Erso. You've only forgotten what that's like, thanks to the Emperor." Ezra says.
"I remember all I need to remember." Jyn says.
"We will see, Erso." Ezra says.
"If your plan is to piss me off, it's working!" Jyn says.
"Maybe I'll just follow you everywhere and be a constant voice in your head. Annoy the kriff out of you until you slip up and blow your cover." Ezra says.
"Not very Jedi like, Bridger. I don't think your dead masters would approve." Jyn says.
"Teasing isn't against the Jedi code." Ezra says.
"Oh, frack off!" Jyn shouts.
"Alright then. Have fun with your new toy. I'll be in touch." Ezra says.
Jyn howls with rage, and fires force lightning at a wall. After a few seconds, the lightning turns from its normal blue to a deep red, and cracks begin to form in the rock. Jyn stops her lightning.
"What the…" Jyn says.
"Ah, yes. Your newly enhanced power. A gift from the crystal. Perhaps this is a suitable place to test your abilities." Abeloth says.
"You're right. No one around." Jyn says. She starts firing red lightning once more, and observes as the wall cracks even more.
"Much more potent than your usual force lightning. This will burn organic flesh in seconds, and eventually, completely incinerate a being. Focus your power on the wall ahead, and see what happens." Abeloth says. Jyn continues to attack the wall, and observes as the cracks become larger and more numerous. Within seconds, large pieces of rock break away from the wall. Jyn smiles.
"I'm...cutting through?" Jyn asks.
"Indeed. Please, continue." Abeloth says. Jyn continues to attack the wall. More rock breaks away as the red lightning cuts deeper into the cavern wall.
After a minute, Jyn stops her attack, leaving a crater about six feet deep.
"Imagine what I could do! To the walls of a building? To enemy forces on a battlefield? To all who oppose me? Nothing will withstand this power!" Jyn says.
"Only if you use it wisely." Abeloth says.
"Speaking of wisdom, isn't this crystal supposed to make me smarter and wiser?" Jyn asks.
"Indeed. That ability will come more gradually. With greater wisdom and intelligence, you may find that you will begin to question some of your past choices, for you did often act rashly before our relationship began." Abeloth says.
"How so?" Jyn asks.
"That is up to you to determine for yourself. I will leave you now. You should return to the rebels, lest you arouse their suspicions." Abeloth says.
"You're right." Jyn says. She turns to face the way she came, and looks to the water below. Then, she looks straight forward, at a solid cavern wall. She says "I can make my own way out of here!"
Jyn starts to attack the wall with red lightning. As the wall begins to crack, the chamber echoes with the sound of triumphant laughter.