- "I've traveled far to this place and time to lay this precious burden at your feet. Use this book to reshape the world as you see fit. Show them what a real god can do, John."
- "You have vision. That book holds the key to your transformation, John, and all you have to do is open it. Use it wisely, John. The universe is in your hands."
- —Mar Novu and John Deegan[src]
The Book of Destiny was a metaphysical book that used to grant a worthy individual the power to alter reality, until Oliver Queen destroyed its powers. It was later retrieved by Mar Novu when he went into the timeline and grabbed the book to learn of the Paragons.
Preparing for a coming Crisis
At some point in the past, the Book of Destiny was bestowed by Mar Novu to individuals of different Earths across the multiverse to test them for a crisis, to which Novu claimed to be beyond his abilities, by letting the chosen individuals create their own Elseworld.
On Earth-90, a struggling Barry Allen attempted to take hold of the Book of Destiny, but stopped short when Mar Novu retrieved it instead. Mar Novu then presumably proceeded in altering Earth-90's reality, to which Barry made his escape.
After John Deegan created his first Elseworld, the only change in reality he made was swapping Oliver Queen's and Barry Allen's realities. The change only affected Earth-1, and did not affect Barry and Oliver's memories. After seeing Novu give the Book of Destiny to Deegan in Cisco's vibe, Oliver speed-sketched the scene, tracing the scene to Gotham City.
John Deegan then hid the Book of Destiny in a dislodged part of a wall in Arkham Asylum. After being confronted by Oliver and Diggle, Deegan retrieved it during his escape, only to be blown away by Supergirl's super breath. The book is then brought to A.R.G.U.S. for Felicity, Curtis, Caitlin and Cisco to analyze it. Their analysis showed that the lock of the book is not only cryptographic but also metaphysical in nature. Barry Allen of Earth-90 then breached inside the building and revealed the true purpose of the Book of Destiny, before Mar Novu appeared to them in public.
After being confronted by Barry, Oliver, Kara, and Barry from Earth-90 who he teleported to somewhere, Novu gave the Book of Destiny back to Deegan and the doctor altered reality once more, and on a larger scale than the last one.
After John Deegan was ordered by Mar Novu to "think bigger", he created his next Elseworld, and the following changes to reality were made:
- Due to Book's limitations, Deegan was only able to alter the reality of Earth-1.
- Barry Allen and Oliver Queen are known and feared, even by other criminals, in Central City as the "Trigger Twins", notorious for having a bank robbery spree, and are the CCPD's highest priority. Their memories from the original reality are still intact, but neither of them are speedsters.
- Malcolm Merlyn, Joe Wilson, and Ricardo Diaz are police officers of the Central City Police Department.
- John Deegan stole most of Kara's powers, leaving her with a weaker version of her abilities, and became Central City's superhero known as "Superman".
- His base of operations is in S.T.A.R. Labs, where Killer Frost, John Diggle, and Alex Danvers work as his agents.
- He got the idea of taking on Clark's appearance when he saw the event of Clark taking on A.M.A.Z.O., which was the only record of him being on Earth-1.
- He created a history where "Superman" once fought a villain named "Bizarro".
- Kara Danvers was known by the Elseworld denizens to have done something horrible, and thus was locked in the pipeline of S.T.A.R. Labs.
- Cisco Ramon is a criminal who breaches inside banks and steals their money and the owner of a criminal bar.
Later, Barry, Kara, and Alex headed to the "Fortress of Solitude" to retrieve the Book. The Book was found unlocked in the Fortress, which, in this reality, was the time vault. Kara opened the Book and tried to change reality back herself, but the power of the Book proved too much for her. Barry then stated that Clark knows how to use metaphysical books, to which Kara grabbed the book and found Clark being bested by Deegan. Kara used her heat vision to throw the counterfeit Superman into the sky and gave the book to Clark. Clark then used the book to return Kara's, Barry's, and Oliver's powers and abilities, and attempted to revert reality, when they were hit by Deegan's thunderclap, who escaped with the book.
Deegan, once more, let the power of Book change reality to his liking, causing panic in Central City. Clark finds Deegan and tries to talk him out of his actions, only for him to summon A.M.A.Z.O. using the Book, who locks in combat with Brainy. Using the light-generating hammer in the Fortress of Solitude, Lois Lane struck the ground, blinding Deegan and setting him off-balance, only to quickly recover the Book. Deegan then directed the Book's power towards Clark, knocking him off and hitting Lois who was struck high into the air. Oliver managed to make it in time and attempted to shoot Deegan with metaphysical arrow given to him by Novu. Deegan reacts to this and tries to hit Oliver with the Book's energy, only for the Book to be shot instead, filling it with too much energy, which caused to book to implode, frying the book, its powers and John Deegan. The loss of the book's powers ultimately reverted reality back to normal.
Anti-Monitor CrisisAfter Oliver's early demise during the Anti-Monitor Crisis, Mar Novu went back to a point in time before the Book was destroyed and retrieved it. By consulting the Book, he learned of seven individuals throughout space and time who may be the key to stopping the Anti-Monitor; the Paragons. A short time later, the Book was stolen by Lex Luthor, who, through the use of an interdimensional extrapolator, began jumping between universes, using the Book to kill every iteration of Superman that he could find. Eventually, he got tired of killing Supermen, and decided to use the Book to pit Superman of Earth-96 against Superman of Earth-38, and make the former try to kill the latter. However, before the two Kryptonians managed to seriously harm one another, Earth-38 Lois Lane and Earth-1 Iris West-Allen were able to knock Lex out and get the Book back and use it to return Earth-96 Superman to his senses. They then brought him back with them to Earth-1, as they'd concluded that he must be the Paragon of Truth they'd been sent to Earth-96 to find. At some point, however, Lex had torn a page from the book. After Earth-1 was destroyed by antimatter, leaving the Paragons as the only known surviving individuals in the multiverse, Lex wrote his name on the stolen page. This seemingly killed Earth-96 Superman, causing Lex to replace him as the Paragon of Truth alongside the rest of the Paragons, who'd fled to the Vanishing Point.
Re-birthing the multiverse
After the Paragons traveled to the dawn of time with Oliver to stop the Anti-Monitor from making the destruction of the multiverse permanent, the eight of them put a plan into motion to restore the multiverse. Oliver told the Paragons that he'd light the spark, and that they'd need to fan the flame. While none of the Paragons knew what that was supposed to mean, Oliver told them that they'd know what to do when it was time. Ultimately, Lex reminded them that he'd used the Book of Destiny to make himself the Paragon of Truth, and that Truth may be able to tell them what they had to do; they could use the page that remained of the Book, which Lex had kept with him, to fan the flame. They concluded that in order for them to all use the Book, they'd need to focus on the qualities that made them Paragons; Hope, Destiny, Truth, Courage, Honor, Love and Humanity. By doing so, they successfully formed a new multiverse.
- Metaphysical connection: The lock of the Book of Destiny only shared a metaphysical connection with whomever the book deems worthy to use it and letting the individual unlock it. With Novu's abilities, the book can also be recalled into his possession.
- Essokinesis/Reality manipulation/Elseworld creation: Once opened, the book allowed its user to manipulate reality to how they see fit in the blink of an eye. This ability of the book was used by Mar Novu as a test to see if the denizens of the created Elseworld would be good enough to be able to survive an oncoming Crisis.
- Absolute reality perception: Once opened, the Book enabled its user to look at the whole of reality.
- Ergokinesis: The Book allowed its user to release surges of energy powerful enough to even harm Kryptonians.
- Power bestowal: The book allows users to grant themselves with powers, such as when Lex Luthor granted himself abilities.
- Anger inducement: When Lex had the Book, he managed to use the book to manipulate the Superman of Earth-96 into attacking the Superman of Earth-38. He did this by turning his love into hate.
- Interdimensional travel: The Book is capable of transporting people between dimensions, as seen when Lex Luthor used the book to send Iris West-Allen of Earth-1 and Lois Lane and Clark Kent of Earth-38 from Earth-167 (where they'd met that universe's Clark Kent) back to the Waverider on Earth-1.
- Universal limit: The user of the book can see and change the events and reality of only the universe that the user is currently in. Visitors foreign to the universe will retain their memories, even if they're on the affected Earth when reality is altered.
- Energy overload: When Oliver shot the Book of Destiny with a powerful arrow of metaphysical nature, the book absorbed too much of its energy and imploded, toasting the book and its powers.
DC's Legends of Tomorrow
- The symbols in the book appear to be the same as the ones used by Nora West-Allen to write in her journal, as well as the ones that Barry Allen wrote in after returning from the Speed Force.
- In the DC comics, the Book of Destiny is also known as Book of Souls and belongs to Destiny of the Endless.