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The Pyro Slayers are members of the Pyro Vipers.
Never Trust a Human (flashback)
Two Pyro Slayers were seen working on the pyramid. Later, they would watch Mambo V being overthrown by Aspheera. When young Wu and Garmadon attempted to overthrow Aspheera, she called in her guards who were soundly defeated by Garmadon due to the power of Forbidden Spinjitzu.
Aspheera revived some Pyro Slayers from their sarcophagus and ordered them to follow her.
The Pyro Slayers were following Aspheera who was on Fire Fang. However, they would spot Nya and started attacking her. While the Pyro Vipers were distracted by Nya, Lloyd attempted to steal the Aspheera's staff, but she spotted Lloyd and the Green Ninja is defeated by Aspheera's Spinjitzu. Lloyd and Nya were then surrounded by the Pyro Vipers, but Zane arrived in his ShuriCopter and saved the ninja.
The Pyro Vipers invaded the Monastery of Spinjitzu and the Pyro Slayers attempted to find Wu, but they found nothing.
After figuring out the location of Wu, the Pyro Slayers witnessed Aspheera using her Elemental Cobras to destroy the door to hangar bay.
The Pyro Vipers fight Wu, Kai, Cole, Jay, and P.I.X.A.L. After initially winning, the rest of the ninja arrived and a legendary Forbidden Spinjitzu battle occurred. Zane ends up with the scroll and froze Aspheera's entire army.
A Pyro Slayer was right right next to Aspheera in P.I.X.A.L.'s dream.
A Pyro Slayer appeared in Zane's flashback.
- 107. "Powerless"
- 108. "Ancient History"
- 109. "Never Trust a Human" (flashback)
- 110. "Under Siege"
- 111. "The Explorers Club"
- 112. "Vengeance is Mine!"
- 113. "A Cold Goodbye" (dream)
- 128. "Awakenings" (flashback)
- The only difference between Pyro Slayers and Destroyers is that Pyro Destroyers wear armor.