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Set 71842 Rontu the Master Dragon
Ninjago

Rontu the Master Dragon

Rontu the Master Dragon is a 2025 Ninjago set built from 381 pieces. It comes with four minifigures and 120 unique parts across dark purple, dark blue, dark bluish grey and black. This page lists every part and colour used in the build.

Set number
71842
Year
2025
Pieces
381
Minifigures
4
Theme
Ninjago
Different parts
120
What can I build with it?

View the official building instructions at LEGO® ↗

Parts list 120

As BrickLink list (XML)

Import on BrickLink: Wanted → Upload, upload the file (or paste its content), pick a Wanted List and add the parts.

Spare parts (17)

These extra parts come with the set in case one gets lost.

Minifigures 4

Alternative models

Fan models by Rebrickable users that you can build (mostly) from this set’s parts. Instructions are available from the designers.

All 2 ideas at Rebrickable ↗

What can I build with it?

Description

A mid-size dragon build

At 381 pieces, Rontu sits in the mid-size bracket for Ninjago sets: bigger than a single vehicle, smaller than the large temple builds the theme is known for. That piece count makes for a build that takes a couple of hours rather than a whole weekend, while still leaving room for a proper construction technique. The 120 unique parts cover hinges, joints and scale-like elements that give the dragon body its shape, several of which turn up less often in vehicle-focused Ninjago sets. Anyone who enjoys building creatures rather than cars or mechs gets a set that leans into articulation and posability.

A dark, cohesive colour scheme

The colour mix leans dark: dark purple, dark blue, dark bluish grey and black dominate, giving the finished dragon a moody, villainous look that suits a master-level opponent. The parts list on this page breaks down exactly which piece comes in which colour, which is handy before sorting a fresh box or hunting for a replacement piece. Because the palette is limited and consistent, the model also sits well next to other dark-coloured Ninjago dragons or vehicles on a shelf, without clashing colours pulling focus away from the build itself.

Four minifigures for storytelling

Four minifigures ship with the set, a generous number for a build in this size class and one that pushes Rontu towards active play rather than display only. Figures can be posed riding the dragon or standing beside it, which suits both an in-air battle scene and a grounded confrontation. For anyone who collects minifigures on their own, this set is also a source of additional Ninjago characters that would otherwise need to be bought separately or found in other sets.

Sorting and rebuilding with the parts list

With 120 unique parts spread across 381 pieces, sorting before building pays off, and the parts list on this page shows each element with its colour and quantity. That makes it straightforward to spot a missing piece or to check which elements could work in a custom dragon build of your own. For a creature set like this, which mixes many different shapes rather than repeating a handful of bricks, having a clear reference for every part also makes it easier to take the model apart and rebuild it later.

FAQ

How many pieces does Rontu the Master Dragon have?
Set 71842 contains 381 pieces, including 120 unique parts.
How many minifigures come with the set?
The set includes four minifigures, enough to act out scenes around the dragon.
What colours make up the set?
The main colours are dark purple, dark blue, dark bluish grey and black. The full breakdown is on the parts list on this page.

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