"Terra and Ventus! But they're gone!" Mickey called out.
"True, but they can be recovered." Yen Sid reasoned.
The four of them—Yen Sid, Mickey, Sora, and Riku— started walking into the Mysterious Tower. There, they would research the power it would take to recover someone lost to the darkness.
"Here, in the Keyblade Chronicles, we will find the answers to what we need to know. It contains all of the information that Masters have gathered across the ages." Yen Sid's wisdom was unfathomable.
The group then peered deeply into the books. There was information on the enemies that have faced the Keyblade Masters before. It was an advanced version of Jiminy's Journal, collected throughout what looked like five generations.
"The Four Enemies: The Heartless, the Unversed, the Nobodies, and Humans…" Sora read plainly from one of the book's title.
"What were the Unversed?" Riku asked
"They were beings of negative emotion, spread by a young boy's dark side, named Vanitas. Vanitas and his Master, Master Xehanort, spread them across the worlds. They nearly took the worlds with them. But thanks to the works of Aqua, Terra, and Ventus, they were irradiated. We will know if Vanitas returns if they return."
"And Humans? Why are they on the list of enemies?" Sora asked.
"People like Xehanort have caused problems for the true Keyblade Masters since they were appointed in the War."
"So, they became enemies because they tried to achieve power through darkness?" Riku proposed.
"Not as much as that, but that they used their power, whether it be Light or Darkness, to attack other innocent people."
"I understand, Master. Thank you." Riku was grateful that he could still use Darkness.
As the group went through the Chronicles, they discovered more about the worlds.
"Each world has a keyhole, but not all worlds have doors. If the keyhole is sealed, then the heart is available to be harvested for Kingdom Hearts. However, if Heartless return to the world, then the keyhole's seal is broken, then all Heartless must be destroyed before sealing it again." Mickey read from the book labeled "Secrets of Worlds".
"Only a Keyblade Master can harvest the hearts of people or worlds." Yen Sid added.
"Then how was Xehanort's Heartless capable of gathering the hearts needed for Kingdom Hearts two years ago?" Sora asked.
"When he took over Riku's heart and body, he was able to use the Keyblade and do it." Mickey explained.
"Not to mention that Xehanort's Heartless was a Heartless version of three Keyblade Masters combined into one person." Yen Sid interjected.
"Three? I thought he was only composed of Terra and Xehanort?" Riku was confused.
"I'm afraid that Master Eraqus also melded his heart with Terra's, creating a huge conflict within Terra's heart." Master Yen Sid remembered sensing that Eraqus had faded. He let out a soft sob.
"So, now that we defeated both the Heartless and the Nobody of the Reincarnated Xehanort, shouldn't all three of them be released from the Darkness and sent back into the world of the living?" Sora was concerned for Terra and Eraqus.
"I'm afraid it's not quite that simple. You see, Terra's Will was the strongest I've ever seen, perhaps even stronger than yours or Riku's, Sora, and Terra's Will stayed with his Keyblade armor. You've even fought against him, in the doorway to the Keyblade Graveyard." Yen Sid was stern with his explanation. Sora didn't know what to make of it.
"So, once we defeated Xehanort's Heartless and Xemnas, the two Elder Masters came back, while Terra is in the Darkness, searching for his Will?"
"Precisely. Then there is the fact that Aqua sacrificed herself in order to save Terra from being swallowed by the Darkness." Mickey added in.
"Your mission, Sora, Riku, and Mickey, is to retrieve the three warriors of the Keyblade that gave you the power to wield it. Find Terra, Aqua, and Ventus."
With that, they brandished their newfound armors, the Armor of Knights, and used the power of the Keyblade Glider to enter a portal of Darkness, searching for the answers to their questions. Where is Aqua? How do we retrieve Ventus? And how will we reunite Terra's Heart, Body, Soul, and Will?
