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“Great dragons of doom! Yes! It took all my magic and the power I assembled to defeat Monstrox! I then split his evil into twelve magical books to keep him from ever coming together again and be a threat!”
Merlok 2.0 in "The Fortrex and the Furious"

Monstrox was an evil sorcerer and archnecromancer who was originally part of the Wizards' Council. Due to his hunger for power and rule, he began experimenting with evil spells and Forbidden Powers, and kept them in evil books. He was successful for some time, and was able to turn Merlok's sister evil.

In a battle with his Monsters, he fought Merlok in Brightwood Forest and was incarcerated after he lost, but was able to escape. He soon became vengeful towards Merlok and battled him again, but was ultimately defeated. Merlok kept his consciousness in a book, turning him into the Book of Monsters, where he was to rest in a library for all eternity while his Lava Monsters were trapped in each of the twelve evil books. Foolishly, Merlok left all the books in the library.

He was awoken when a young and under-the-weather jester named Jestro entered the library. In an act of pure desperation, he grabbed the book, and he summoned a monster. Merlok cast a spell to destroy the monster, scattering the evil books everywhere.

He and Jestro would go on to locate the evil books throughout the world, finding Lava Monsters along the way and him growing stronger, going to siege against the capital but failed the first time.

After obtaining all the books, he tried to restore himself into human form but was defeated after being magically attacked by Techcalibur. His essence was then sent to the skies, transforming him into the Cloud of Monstrox.

He then worked with Jestro once more to locate the Forbidden Powers to awaken an even more dangerous force, the Stone Colossus. During this time, he transformed Clay to stone, causing him to turn to the evil side for a bit of time.

Monstrox was successfully able to control the Colossus and lay siege upon Knighton. He was only defeated after an extreme showing of force from the Nexo Knights, Mechlok and a powerful spell.

After being destroyed as the Stone Colossus, he was reborn by Ruina Stoneheart as a digital virus, the Monstrox virus.[1] He went on to meet an old friend, Dragov, and destroy Merlok once and for all.


Prior to the series

Monstrox, having been a member of the Wizards' Council and ally to the likes of Merlok, discovered the Forbidden Powers. The Powers drove him mad and corrupted him as he experimented with dark magic. He then chose to use the Forbidden Powers and his dark magic to wreak havoc across the land. The Council was left with no other choice but to expel him from the council and end his reign of terror, and so Merlok set out to defeat Monstrox.

After Merlok had turned his original army into stone, shrinking his castle to be placed inside a snow globe, Monstrox vowed revenge against Merlok. The good wizard Merlok eventually defeated Monstrox by turning him into a book, dividing most of his evil power among eleven other spellbooks, believing that he could control him and his powers. Although he knew that destroying the spell books would ensure Monstrox's eternal defeat, Merlok was reluctant to sacrifice sources of such potent magic. He took the books, including the Book of Monsters himself, to his library, where they sat on a shelf for many years.

Season 1: The Book of Monsters

Following his defeat, Monstrox bided his time and plotted revenge against Knighton. Knowing that he still had some power even in his book form, he waited years to find someone that he could manipulate into acting as his pawn. He found it in a young Jestro, dropping out of The Knight's Academy, voicing his insecurities and concerns with Merlok. Realizing he could use Jestro's insecurities against him he spent the next five or six years plotting.

His plan eventually came to fruition when Jestro found the Book of Monsters after wandering off after the embarrassment and humiliation of his failed performance at the Knights' graduation. Sensing a perfect pawn at last, the Book manipulated and coerced Jestro into becoming a "bad boy," promising him tremendous power that would stop anyone from laughing at him ever again. With the Book's power, Jestro summoned the Lava Monsters, including a Bookkeeper to hold the Book of Monsters so Jestro wouldn't have to. They then planned out multiple attacks on Knighton, but were pushed back and defeated.

Season 2: Books of Power

During the ensuing war, the Book of Monsters encouraged Jestro to seek out the other eleven spell books which contained his remaining power, explaining that he could perform new and stronger spells by consuming them. Despite the Nexo Knights' best efforts and a number of other setbacks (including Jestro himself returning to the side of good), the Book eventually succeeded, restoring Monstrox's full power. He promptly attempted to possess Clay, sending his army to delay the other knights when they arrived to save their comrade. The knights held their own against the lava monsters, but this only allowed Monstrox to reabsorb their energy, making him powerful enough to defeat them all in a single strike.

Just when all hope seemed lost, Clay was given the sword Techcalibur, containing Merlok's data, by the Black Knight mech, who allowed himself to be sucked into Monstrox's mouth. Overcome by the pure magic energy, the villain exploded spectacularly, taking all of his summoned monsters with him and leaving only the charred cover of his book form. The Kingdom of Knighton celebrated Monstrox's defeat, but Jestro saw the former necromancer's face in a distant cloud, hinting at his survival.

Season 3: Storm Over Knighton

Unbeknownst to the kingdom, Merlok's sacrifice only served to destroy the Book of Monsters' pages, the binding was preserved and Monstrox lived on as the evil spirit within endured in the form of a living storm cloud. Enraged at yet another failure, Monstrox changed his plans from conquering Knighton to destroying it outright and mind controlled Jestro into becoming evil again. He then set about reviving his original army of monsters by using his new lightning abilities to reanimate their petrified bodies, all the while planning to unleash the Stone Colossus.


Primarily defined by his dry sense of humor and false pretenses of support and encouragement, Monstrox is shown to be very sarcastic and manipulative, easily getting what he wants through coercion and persuasion. Often using those around him as a means to an end, he tends to be abusive towards his underlings.

Though capable of sentimentality, nostalgia and affection, Monstrox continues to be abrasive and mean-spirited. With a victim complex where any slight against him is interpreted as betrayal and failure on the part of those who slights him and sends him into fits of either tears or rage. He can also play the harmonica, but he is an awful singer, according to Jestro.


The Book of Monsters was a large brown book with a gruesome, living face on its cover. He uses a silk bookmark as a lizard-like tongue, and grows larger with every spellbook he consumes. He has yellow eyes with slit pupils and very sharp teeth.

Following his second defeat, Monstrox appeared as a white storm cloud with his old face on the front. In this state, he can move independently, generate electrical bolts, and channel dark magic to animate unliving objects or corrupt other people. Instead of a tongue, electricity sparks from his mouth.

In his virus form, he became an essentially green version of his human self but with no printing on his outfit and with his face being more visible. descriptions

Book of Monsters

The Book of Monsters is not bad. He is terrible! Manipulative, power-hungry and really good at being mean to others. He is highly intelligent and filled from cover to cover with both horrible monsters and vicious plans to take over Knighton. Since he is just a book, he needs someone to perform the actual bad deeds for him. Someone he can lure with promises of power, manipulate with ideas of evil and shout insults at when it fails.

Cloud of Monstrox

First he was a necromancer in human form, then he was trapped in the Book of Monsters and now he is a cloud. Monstrox is the most evil... uhm... vapor? But even in the form of a cloud, Monstrox is still very powerful. His lightning can turn good people evil and animate stone statues to obey his every twisted command. He has given up on taking over Knighton, now he is out for full-on destruction, of course mixed with his usual humorous insults. You think you have seen bad weather? Then check out this dark cloud![2]



Nexo Knights

Season 1: The Book of Monsters

Season 2: Books of Power

Season 3: Storm Over Knighton

Season 4: The End





  • Mark Hoffmeier came up with the idea of the Book of Monsters, when Tommy Andreasen brought a life-sized version of the Necronomicon from Evil Dead which acted as a puppet, which he made talk like Stan Lee.[3]
  • He can play the harmonica,[4] and is quite a good comedian.[5]
  • He can speak a language named "Cloud Latin," a parody of Pig Latin.
  • Monstrox's growing love for jokes and puns are somehow influenced by Jokes Knightly.[5]
  • Before he was revealed as Monstrox, a fan at San Diego Comic Con 2016 correctly guessed his true identity.[6]
  • Tommy Andreasen thinks he is the "best character ever."[7]
  • Mark Oliver, his voice actor, compared his voice and personality to that of people from New York.[8]


Main article: Monstrox/Gallery


view · talk · edit Characters
Nexo Knights: Merlok 2.0 · Clay Moorington · Lance Richmond · Aaron Fox · Macy Halbert · Axl · Robin Underwood
Allies: Ava Prentis · Jestro · King Halbert · Queen Halbert · Herb Herbertson · Alice Squires
Squirebots: Aaronbot · Axlbots · Chili Vanilla · Claybots · Cowbots · Éclair · Haute FancyPants · Kingbot · Lotta Fun · Lotta Budget · Macybot · Manuel · Persnickety Marge · Riccardo
Merry Mechs: Robot Hoodlum · Dennis · JohnBot
Knights' Academy: Beak · Brutzle · Captain Clash · Chef Munch · Ethan Zilgo · Fletcher Bowman · Griffiths · Izzy Richmond · Knightmares · Ottofae · Relik · Scapeland · Swordmore Brickland
Tighty Knighties: Jorah Tightwad · Shia LaBlade · Jousting Bieber · Brickney Spears · The Blok
Lava Monsters: Mayor Magmar · Beast Master · Lavaria · Whiparella · Moltor · Flama · Burnzie · Sparkks · Bookkeeper · Infernox · Ash Attackers · Crust Smashers · Flame Throwers
Stone Monsters: Monstrox · Stone Colossus · Ruina Stoneheart · Krakenskull · Garg · Roberto Arnoldi · Three Brothers (Roog · Reex · Rumble) · Harpies (Hilda · Ingrid · Ulrika) · Roguls · Gargoyles · Grimrocs · Stone Stompers · Stone Monster · White stone statue · Bedrock Monster
CyberBiters: Monstrox · Dragov · Ruina Stoneheart · Fred · Pola · Cezar · Berserker · MechaByter · MegaByter · VanByter No. 307 · VanByter No. 407 · CyberByters · InfectoByters
Forest Monsters: Mushlord · Baron Badwood · Dame Flora · Bramblina · Loggerhead · Deadwood & Knot · Elm of the Dark Realm
Sea Monsters: Behemoth of Brine · Marquis de Seaweed · Siren · Sharkerado · Mate Squiddybeard · Savage · Poop · Deck
Order of the Eight: Augustin Halbert · Reginald Brickland · Therence Richmond
Other: Aaron's father · Aaron's mother · Arthur Eaglewing · Axlina · Baron von Bludgeoneous · Cheddarton · Chopper · Coughmeyer · Cuthbert Richmond · Dustin Hoffmeier · Edvard Evanson · Gobbleton Rambley · Goldie Richmond · Hadda Hammerin · Jack Shields · Jebediah Hazard · Jestro cosplayer · Jestro cosplayer's grandmother · Jokes Knightly · Jurgen von Stroheim · Lance cosplayer · Mama Axl · Maynard · Mooper · Morty · Ned Knightly · Papa Axl · Princess · Ramsey · Robin's father · Roger the Scrubber · Roger van Nelsing · Royal Soldiers · Slab Rockowski · Trix Taylor · Woody Carverer