LEGO NINJAGO The Fire Knight Mech Building Set - Model Kit with Kai Minifigure from Legends Monstrosity - Teen Room Decor - Gift for Teenage Boys and Girls, Ages 14+ - 71846
LEGO NINJAGO The Fire Knight Mech Building Set - Model Kit with Kai Minifigure from Legends Monstrosity - Teen Room Decor - Gift for Teenage Boys and Girls, Ages 14+ - 71846
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LEGO NINJAGO The Fire Knight Mech Building Set - Model Kit with Kai Minifigure from Legends Monstrosity - Teen Room Decor - Gift for Teenage Boys and Girls, Ages 14+ - 71846

Key item features

  • Epic Battle: Teens aged 14 and up can construct The Fire Knight Mech engaged in combat with an ancient sea monster, inspired by NINJAGO Legends Monstrosity.
  • Poseable Models: Both the mech and the sea monster are designed to be posed, allowing for dynamic pretend battles or display as fan-built art.
  • Included Minifigures: The set features a caped Kai minifigure with a magical sword, who fits inside the mech, and a fisherman minifigure in a boat.
  • Displayable Decor: This 996-piece model, standing over 10 inches (26 cm) tall on its display stand, serves as an impressive piece of room decor that can be removed for play.
  • Building Assistance: The LEGO Builder app offers an intuitive guide with 3D model rotation, zoom functions, and progress tracking to enhance building skills.
  • Teenage Gift: An ideal birthday or special-occasion gift for teenage NINJAGO fans who enjoy LEGO building toys and model construction.
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Current price is $112.97
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Customer ratings & reviews

4.8 out of 5 stars
stars28 ratings22 reviews
How item rating is calculated
  1. 5 stars93% (26)
  2. 4 stars0% (0)
  3. 3 stars4% (1)
  4. 2 stars4% (1)
  5. 1 star0% (0)

Reviews summary

Pros

  • : Features a construction process with a pleasing aesthetic.
  • : Incorporates many intricate design elements.
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Showing 1-3 of 22 reviews

Jun 28, 2025
Kitkatgreedy85!
5 out of 5 stars review

Seller Verified Purchase

Worth ever penny

This build is beautiful and my boyfriend loved it. The box is a beautiful price of artwork. My boyfriend enjoyed the build and say it was easy and even bought the companion build Ninjago Dragons Rising Cole's Titan Dragon Mech 71821. He said the build was enjoyable and not complicated. The build was worth every penny and is a definite collectors item. He hopes to see more from Lego in this line to continue the collection.

Review from LEGO
Helpful?29MGIJ0C1XTP13986164411
Jun 9, 2025
Weston
5 out of 5 stars review

Seller Verified Purchase

Amazing

This is an amazing set, for starters I enjoyed the fact that it came with a free poster, as Ninjago posters are hard to come by in countries like my own where the magazine can be hard to come by. I also greatly enjoyed the concept art at the end of the instruction book, and I am autistic and greatly enjoyed Ninjago concept art. As for the actual set, I was very pleasantly surprised that Ninjago Legends is focusing on a display piece or model aimed at older audiences compared to the sets from the dragons rising Tv show. It is a very cool change, and it offers something new and unique for the theme. I am a big fan of the exclusive Kai figure as well, and am happy to add it into my collection, I also enjoy the fact it is somewhat similar to the Master Lloyd suit from tournament of sources, which perfectly represents the ninjas taking on mentor/master roles in dragons rising. The build was very fun and looks fantastic, it is already one of my favourite pieces in my collection. I watched some of dragons rising season 1 while I built it and I am excited for Ninjago legends to release.

International review
Review from LEGO
Helpful?29MGIJ0C1XTP13986164411
Mar 27, 2026
Cosmic
5 out of 5 stars review

Amazing set

The mech looks absolutely great I love all the details on it. the cape is an amazing touch I love how even though we have so many mechs this still feels like something new . the figures are alright too kai's suit is amazing . the scene depicted with the fisherman falling off the boat and the tentacle being is absolutely amazing and great to display.

International review
Review from LEGO
Helpful?29MGIJ0C1XTP13986164411