The Book of Monsters catching a cold means trouble for the NEXO KNIGHTS when he can create an entirely new kind of “snotty” monster.

Power up with The Axe of Merlok and defeat your foes! When Macy is surrounded on all sides by bad guys, she summons the awesome power of the The Axe of Merlok! Watch as 5 spinning axes fall from the sky – 3 from the left, and 2 from the right, and each axe deals area-of-effect damage upon landing. Take a ‘byte’ out of the evil tech infectious bad guys and team up with the NEXO KNIGHTS™ team!

Forbidden Power missions are spawned on the map by the zap of Monstrox. See what happens when the knights take on Cosmic. Before starting the mission try out different Combo NEXO Powers to find the perfect one that can counter these Cosmic attacks.

Rival to the King, Jorah Tightwad thinks his knights – the Tighty Knighties – are easily better than the NEXO KNIGHTS, so he challenges King Halbert to prove who’s better during the King’s Birthday Tournament.

In a massive chase around Knighton, the NEXO KNIGHTS attempt to keep the Book of Betrayal out of the Book of Monster’s grip. But the evil book is persistent. Will he get the final piece of his evil puzzle?

Clay has arrived to the battlefield ready to fight, but he needs some help! Watch him power up by summoning The Crossbow of Merlok with his shield. With this special Merlok Power, a mounted crossbow appears in the middle of the screen and shoots in a circular motion for 20 seconds, dealing area-of-effect damage. Every 3 seconds, the crossbow stops and then starts to rotate again in the opposite direction.

Axl is the biggest NEXO KNIGHTS™ hero in the kingdom, but even he needs to power up to defeat evil! When he needs that extra charge on the battlefield, Axl summons The Hammer of Merlok. With this Merlok Power, a giant electric charged hammer falls from the sky in the middle of the screen, flattening enemies, and discharging a wave of golden electrical energy every 3 seconds that damages and paralyzes enemies!

Robin wants to join the NEXO KNIGHTS heroes in battle, but he is too small. Robin starts developing extra legs to make him taller and ends up developing the powerful Ultra Armor. The knights use the ultra armor to defeat the monsters even more easily than before. All cheer Robin's great idea.