LEGO Ninjago 71842 Rontu the Master Dragon

LEGO NINJAGO 71842, Rontu the Master Dragon, depicts an articulated dragon with characters from the ninja universe. Released in 2025, it contains 381 pieces and belongs to the Ninjago theme.

Rontu the Master Dragon sits within the LEGO NINJAGO theme, where dragons often serve as allies, challenges or focal points for ninja action. The build centers on a dragon figure that can be used for battle scenes, training sequences or character focused storytelling.

The French retail title also identifies an articulated dragon figure, a stud shooter, a blade and ninja accessories, all pointing to a play model built around action features.

In a wider Ninjago collection, it can be grouped with Lloyd, Sora and Wyldfyre focused scenes, with Zarkt providing an opposing character.

Inventory of set 71842

The inventory of set 71842 lists 381 pieces, spare parts excluded: 138 different lots (one shape in one color) for 120 part shapes. The box also contains 18 spare parts, for small elements that are easy to lose.

Colors of set 71842

Main color: dark purple, making up 17% of the parts, followed by black (14%) and dark bluish gray (14%).

Part types

Most common parts in set 71842

98 of the 120 part shapes in this set have their own page on Setopedia, with their colors, element numbers and the other sets that use them. See all LEGO parts

Exclusive parts in set 71842

2 part shapes in set 71842 appear in no other set in the catalog, most often printed elements, stickers or molds specific to the model. If one gets lost, you will need to look for it individually, for example on BrickLink, rather than in another set. Counting colors, 4 lots in the set are not found in any other set.

Rebuilding set 71842 from another set

Share of the parts of set 71842 found in each of these similarly sized sets, counting shape, colour and quantity:

No similarly sized set goes above 25%: the model relies on a little-shared assortment, most of which has to be gathered piece by piece.

Size of set 71842 within its line

With 381 pieces, set 71842 ranks #150 out of 396 Ninjago sets in our database, which have an average of 470 parts. Among the 625 sets released in 2025, it ranks #265.