The ghost invasion[1] was a conflict that took place sometime after the Second Serpentine War in the city of Stiix. The battle was fought with the ninja and their allies going up against Morro and the Ghost Warriors.
History[]
After Morro claimed the Realm Crystal from the Tomb of the First Spinjitzu Master,[2] he traveled to Stiix and used the artifact to open a portal to the Cursed Realm, allowing an army of spirits to spread throughout the city. After Stiix was taken over by the ghosts, the ninja were forced to sneak in, hoping to destroy the Realm Crystal and get Nya to Morro so she could fight him and the ghosts with her element.
Soon enough, a battle broke out, with the ninja fighting the other ghosts while Lloyd and Nya fought Morro. As Cole, Kai, Jay, and Zane battled the ghosts, Lloyd had an opportunity to destroy the Realm Crystal but Morro gave him second thoughts, as it was the last means of Lloyd ever seeing his father in the Cursed Realm. Lloyd's hesitation allowed the Preeminent to emerge from the realm and into Stiix.[3]

The Preeminent begins her assault on Stiix.
The ninja began their next part of the battle against the Preeminent, whose presence prompted Wu to begin evacuating the civilians on a steamboat. However, the ghost warriors began taking to possess countless buildings in the City of Stiix, giving her a relative immunity to water and greater mobility. She then proceeded to test out this new tolerance before chasing after several citizens on a fleeing ferry in order to devour their souls.

Morro and Lloyd fighting in Chima
After saying goodbye to his father, Lloyd rejoined the battle, fighting Morro and traversing several realms while the ghosts created a giant suit for The Preeminent using the buildings in the city. While Lloyd obtained the Realm Crystal, Morro got his hands on using it to return to Ninjago while stranding Lloyd in an unknown realm.
Back in Stiix, as the ninja fled with the citizens on board the steamboat, The Preeminent waded out into the Endless Sea, eventually seizing and crippling the ship so she could devour the souls of those onboard.

The destruction of the Preeminent.
At that moment, Nya found the will to unlock her True Potential, summoning a massive tidal wave that toppled over The Preeminent and sent it sinking into the sea. All of the Ghost Warriors died as a result of the Cursed Realm's destruction. Morro was seized by one of the beast's tentacles, but his hand was grabbed by Wu, who told him to hang on. However, seeing the error of his ways, Morro rejected Wu's offer to help him, instead of giving his former master the Realm Crystal before bidding him farewell and sinking into the sea and dying. Along with Morro and the Ghost Warriors, all the other prisoners of the Cursed Realm died, including Garmadon, Master Chen, and all of the Anacondrai Cultists[4] (though Clouse was able to escape).[5]
Aftermath[]
Though the ninja saved Stiix, and would soon gain fame for their triumph, the city was left heavily damaged primarily due to the Preeminent. This also resulted in some of the citizens unfairly resenting the ninja by blaming them for Stiix's destruction.[5] The citizens also gained a dislike for ghosts.[6]
It turns out with destroying a realm, its sister realm will be destroyed as well. This was seen when Djinjago was destroyed, due to its status as the sister realm of the Cursed Realm.[7]
Appearances[]
Ninjago: Masters of Spinjitzu[]
Season 5: Possession[]
- 53. "Curseworld, Part I"
- 54. "Curseworld, Part II"
Season 6: Skybound[]
- 55. "Infamous" (mentioned)
Ninjago: Decoded[]
- 1. "Legacy" (video)
- 2. "Vehicles and Mechs (video)
- 4. "Ninjago's Most Wanted" (video)
- 6. "The Elemental Masters" (video)
- 8. "Rise of Garmadon" (video)
- 10. "Greatest Battles" (video)
Season 8: Sons of Garmadon[]
- 80. "The Quiet One" (pictured)
- 81. "Game of Masks" (indirectly mentioned)
Tales from the Monastery of Spinjitzu[]
- 1. "Master Class (painting)
- 2. "Green and Gold" (painting)
- 3. "The Weekend Drill" (painting)
- 4. "Elemental Rider" (painting)
- 5. "Blue Lightning" (painting)
- 6. "Samurai X-Treme" (painting)
Season 10: March of the Oni[]
- 95. "The Darkness Comes" (painting)
- 98. "Endings" (painting)
Season 11: Secrets of the Forbidden Spinjitzu[]
- 99. "Wasted True Potential" (painting)
Prime Empire Original Shorts[]
- 1. "Let's Dance" (painting)
Season 13: Master of the Mountain[]
- 145. "Shintaro" (painting)
Season 14: Seabound[]
- 165. "A Big Splash" (painting)
The Virtues of Spinjitzu[]
- 1. "Curiosity" (painting)
Season 15: Crystalized[]
- 186. "A Painful Promise" (painting)
- 210. "Roots" (painting)
Trivia[]
- This was the first time a ninja was responsible for a mass amount of deaths.
- The second time was the Yeti annihilation during the Long Winter.