How many pieces does the LEGO Rontu the Master Dragon (71842-1) have?

The LEGO Rontu the Master Dragon set (71842-1) contains 381 pieces. It was released in 2025 as part of the LEGO Ninjago theme.

How can I find missing parts for LEGO set 71842-1?

On BrickMissing you can check which parts from the LEGO Rontu the Master Dragon (71842-1) you already own. Add your LEGO collection and we'll show exactly which of the 381 pieces you're missing and which you already have.

Can I build the LEGO Rontu the Master Dragon with parts I already have?

Use BrickMissing's free parts checker to find out. Add LEGO sets you own to your collection and we'll cross-reference all 381 parts to show your buildability percentage and which specific pieces you still need.

What theme is the LEGO Rontu the Master Dragon from?

The LEGO Rontu the Master Dragon (71842-1) belongs to the LEGO Ninjago theme. You can browse all Ninjago sets on BrickMissing to find more sets from this theme.

Rontu the Master Dragon

🏷️ 71842-1•🎨 Ninjago•📅 2025•🧱 381 parts•Intermediate

LEGO NINJAGO Rontu the Master Dragon (71842-1) brings a pivotal creature from season 3 of NINJAGO Dragons Rising to life. This 381-piece set constructs Rontu, featuring a fully posable tail, legs, wings, head, and jaw through articulated joints, enabling dynamic battle poses against the Master of Misfortune, Zarkt. Ninja warriors Lloyd, Sora, and Wyldfyre are included, each armed with a ninja weapon, ready to ride Rontu utilizing the two minifigure positions on its back. The dragon integrates stud shooters under each wing for active play. A brick-built mini shrine with a secret message, revealed by Lloyd’s translucent reveal blade accessory, completes the scene, setting the stage for epic good-versus-evil confrontations.

Parts Inventory

🧱 381 parts

Part	Color	Qty
Sticker Sheet for Set 71842-1 10113523	Unknown	1×
Plate Special 1 x 2 with Clip Horizontal on Side 11476	Black	2×
Slope Curved 2 x 1 No Studs [1/2 Bow] 11477	Dark Purple	12×
Plate Round 4 x 4 with 2 x 2 Round Opening 11833	Black	2×
Plate Special 1 x 2 with 5.9mm Centre Side Towball 14417	Dark Bluish Gray	4×
Plate Special 1 x 2 5.9mm Centre Side Towball Socket 14704	Light Bluish Gray	8×
Tile Round 2 x 2 with Bottom Stud Holder 14769	Dark Purple	2×
Slope Curved 2 x 2 x 2/3 15068	Dark Blue	11×
Slope Curved 2 x 2 x 2/3 15068	Dark Purple	7×
Plate Special 1 x 1 with Vertical Tooth 15070	Pearl Gold	10×

Showing 10 of 138 parts

🔓 Sign up to see all parts

Plate Special 1 x 2 5.9mm Centre Side Towball Socket	14704	Light Bluish Gray	8×
Tile Round 2 x 2 with Bottom Stud Holder	14769	Dark Purple	2×
Slope Curved 2 x 2 x 2/3	15068	Dark Blue	11×
Slope Curved 2 x 2 x 2/3	15068	Dark Purple	7×
Plate Special 1 x 1 with Vertical Tooth	15070	Pearl Gold	10×
Slope 45? 2 x 1 with 2/3 Cutout [New Version]	15672	Dark Purple	4×
Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard]	21459	Pearl Gold	1×
Brick 1 x 2 x 3 with Bottom Stud Holder	22886	Light Bluish Gray	1×
Plate Special 1 x 2 with End Towball	22890	Dark Bluish Gray	2×
Bar Holder with Hole and Bar Handle	23443	Pearl Gold	2×
Plate 2 x 2 Corner	2420	Dark Tan	4×
Plate 2 x 12	2445	Black	1×
Weapon Sword / Saber with Curved Blade and Hilt	25111	Pearl Gold	1×
Tile Round 1 x 1 Quarter	25269	Dark Blue	4×
Tile Round 1 x 1 Quarter	25269	Dark Bluish Gray	2×
Tassel with 1 x 1 Round Stud	25375	Pearl Gold	1×
Plate Special 1 x 2 Side Handle [Free Ends]	2540	Black	1×
Plate 4 x 4 Corner	2639	Dark Bluish Gray	2×
Plate 4 x 4 Corner	2639	Dark Blue	2×
Wedge Plate 2 x 2 Cut Corner	26601	Dark Blue	6×
Technic Disc 3 x 3	2723	Black	2×
Tile Special 2 x 2 Corner with Cut Corner - Facet	27263	Dark Blue	2×
Wave / Power Blast Rounded Energy with Bar Handle	27393	Trans-Orange	2×
Tile 2 x 2 Curved, Macaroni	27925	Dark Purple	12×
Minifig Head [Plain] [Vented Stud - 2 Holes]	28621	Trans-Light Blue	2×
Bracket 1 x 2 - 1 x 4 [Rounded Corners at Bottom, Square Corners at Top]	28802	Black	4×
Brick 1 x 1	3005	Black	2×
Brick 1 x 1	3005	Dark Blue	2×
Brick 1 x 4	3010	Dark Blue	2×
Plate 2 x 4	3020	Dark Bluish Gray	2×
Plate 2 x 4	3020	Dark Purple	4×
Plate 2 x 3	3021	Dark Blue	2×
Plate 2 x 3	3021	Black	1×
Plate 2 x 2	3022	Dark Bluish Gray	4×
Plate 2 x 2	3022	Dark Purple	6×
Plate 1 x 2	3023	Dark Pink	17×
Plate 1 x 2	3023	Pearl Gold	4×
Hinge Plate 1 x 2 Locking with 1 Finger On Top	30383	Light Bluish Gray	4×
Brick Round 1 x 1 Open Stud	3062b	Trans-Light Blue	1×
Tile 2 x 2 with Groove	3068b	Dark Tan	4×
Tile 1 x 1 with Groove	3070b	Dark Purple	4×
Animal / Creature Body Part, Claw with Clip	3171	Pearl Gold	12×
Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin	32064a	White	2×
Slope Curved 2 x 2 x 2/3 Inverted	32803	Dark Bluish Gray	3×
Plate Special 2 x 2 with Only 2 studs	33909	Dark Blue	2×
Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]	3484	Dark Bluish Gray	1×
Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]	3484	Pearl Gold	2×
Weapon Chakram / Hoop Blade / Ring	35485	Pearl Gold	2×
Brick 1 x 3	3622	Black	2×
Bracket 1 x 1 - 1 x 1	36841	Dark Blue	2×
Technic Brick 1 x 2 [1 Pin Hole]	3700	Black	2×
Technic Brick 1 x 4 [3 Pin Holes]	3701	Dark Bluish Gray	2×
Technic Axle 4	3705	Red	2×
Technic Axle 8	3707	Black	1×
Plate 1 x 4	3710	Dark Blue	2×
Plate 1 x 4	3710	Dark Bluish Gray	2×
Equipment Lantern	37776	Pearl Titanium	1×
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)	4032a	White	4×
Brick Special 1 x 1 with Headlight	4070	Black	2×
Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring]	4081b	Dark Blue	2×
Technic Beam 1 x 2 Thin	41677	Dark Bluish Gray	4×
Wedge Curved Inverted 6 x 4	43713	Dark Purple	1×
Dish 2 x 2 Inverted [Radar]	4740	Black	2×
Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End	47457	White	1×
Brick Special 1 x 1 with Studs on 2 Sides	47905	Dark Bluish Gray	1×
Slope Inverted 45° 4 x 2 Double	4871	Dark Bluish Gray	1×
Plate Special 1 x 1 with Tooth	49668	Light Bluish Gray	1×
Slope Curved 3 x 1 No Studs	50950	Dark Purple	2×
Wedge Plate 2 x 4	51739	Dark Blue	2×
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small	53451	Dark Pink	2×
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small	53451	Black	3×
Technic Ball Joint with Through Axle Hole	53585	Black	2×
Slope 30° 1 x 1 x 2/3 (Cheese Slope)	54200	Black	2×
Slope 30° 1 x 1 x 2/3 (Cheese Slope)	54200	Dark Bluish Gray	1×
Slope 30° 1 x 1 x 2/3 (Cheese Slope)	54200	Dark Blue	2×
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 Teeth	57360	Dark Bluish Gray	4×
Technic Brick Modified 2 x 2 with Ball and Axle Hole, with 6 Holes in Ball	57909b	Dark Bluish Gray	3×
Creature Body Part, Dragon, Wing Large	5973	Dark Pink	2×
Plate Round 4 x 4 with Pin Hole	60474	Dark Bluish Gray	1×
Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip]	60897	Dark Purple	2×
Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip]	60897	Red	2×
Brick 1 x 12	6112	Dark Purple	2×
Technic Pin with Friction Ridges Lengthwise with No Center Slots	61332	Black	3×
Plate Round 1 x 1 with Solid Stud	6141	Dark Purple	2×
Plate Round 1 x 1 with Solid Stud	6141	Black	1×
Plate Special 1 x 2 with Clip Horizontal on End	63868	Black	2×
Wedge Curved 4 x 3 No Studs [Plain]	64225	Dark Purple	1×
Technic Axle Pin 3L without Friction Ridges and 2L Axle	65249	Light Bluish Gray	2×
Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin Hole	66906	Black	2×
Weapon Hilt Symmetric	66909	Sand Green	1×
Technic Brick Special 2 x 2 with Ball Socket Wide and Axle Hole, No Arm Holes	67696	Black	5×
Launcher, Plate Special 1 x 2 with Mini Blaster Square	69754	Pearl Gold	2×
Launcher Trigger, Weapon Gun Trigger	69755	Dark Bluish Gray	2×
Energy Effect, Flame, Squiggly	7105	Trans-Dark Pink	2×
Weapon Sword, Broad with Trans-Red Blade pattern	7182pat0001	Pearl Gold	1×
Creature Body Part, Dragon Head Upper Jaw with Bright Light Yellow Eye, Dark Pink/Blue Markings print	7243pr0001	Dark Blue	1×
Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate	73109	Light Bluish Gray	1×
Bracket 1 x 1 - 1 x 2 Inverted	73825	Black	6×
Bracket 5 x 2 x 1 1/3 with Bottom Stud Holder	79180	Black	1×
Bracket 1 x 1 - 1 x 2	79389	Dark Bluish Gray	4×
Plate Angled 2 x 2 with Step and Hole in Center	79846	Dark Bluish Gray	2×
Brick Special 2 x 5 with Slope, Studs on Side	79897	Dark Blue	2×
Animal Body Part / Plant, Tail / Trunk / Tentacle / Tongue / Vine / Tree Branch (Long Tip)	80497	Dark Pink	2×
Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style]	85080	Black	2×
Plate Round 1 x 1 with Open Stud	85861	Pearl Gold	2×
Plate Round 1 x 1 with Open Stud	85861	Dark Bluish Gray	3×
Slope 30? 1 x 2 x 2/3	85984	Dark Purple	4×
Chain 6L [5 Links]	92338	Black	1×
Plate Special 1 x 2 with Angled Handles on Side	92692	Pearl Gold	4×
Tile Round 1 x 1	98138	Dark Pink	4×
Tile Round 1 x 1	98138	Dark Tan	3×
Bracket 1 x 2 - 2 x 2 Inverted	99207	Dark Bluish Gray	4×
Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot]	99563	Black	1×
Bracket 1 x 2 - 1 x 2 Inverted	99780	Dark Tan	16×
Bracket 1 x 2 - 1 x 2	99781	Dark Blue	7×
Hair Swept Back, Tan with Headband Pattern	69562pat0001	Bright Green	1×
Hips and Bright Green Legs with Dark Red Sash, Knee Caps, Robe Ends, Dark Green Trim print	970c06pr0007	Bright Green	1×
Minifig Neckwear Shoulder Armour With Pearl Gold Dragon pattern	7104pat0001	Bright Green	1×
Torso, Ninja Robes, Dark Green Trim, Dark Red Plated Armor, Dark Tan Strap, Gold Dragon print, Bright Green Arms, Black Hands	973c06h03pr0003	Bright Green	1×
Minifig Head Lloyd, Reddish Brown Eyebrows, Green Eyes, Lopsided Open Mouth Grin / Gritted Teeth Print	3626cpr2255	Yellow	1×
Hair, High Ponytail with Dark Blue Headphones, Cat Ears pattern	5326pat0001	Coral	1×
Minifig Neckwear Shoulder Armour With Pearl Gold Dragon pattern	7104pat0001	Dark Blue	1×
Hips and White Legs with Coral Sash, Robe Ends, Gold/Sand Blue Knee Pads print	970c27pr0032	White	1×
Torso, Ninja Robes, Dark Blue/Coral Trim, Dark Blue Belt, Gold Cat print, White Arms, Dark Blue Hands	973c27h05pr0003	White	1×
Minifig Head Sora, Coral Eyeshadow and Lips, Gold Markings, Golden Eyes / Angry Grin print	28621pr3985	Yellow	1×
Hips and Dark Red Legs with Orange Sash, Robe End with Sand Green Trim, Red Knee Wraps print	970c10pr0004	Dark Red	1×
Torso, Ninja Robe, Sand Green Trim, Dark Tan Armor Plating, Orange Sash print, Yellow Arms, Black Hands	973c01h03pr0006	Dark Red	1×
Hair, Mid Length with Bun	5311	Red	1×
Minifig Head Wildfyre, Red Eyebrows, Scar, Angry Teeth print	28621pr3996	Yellow	1×
Hat, Ronin	5988	Black	1×
Minifig Head Zarkt, Red Eyes, Dark Tan Sharp Teeth, Fangs, Dark Purple Markings, Closed Mouth / Open Mouth	28621pr9714	Black	1×
Hips and Legs Under Dress/Robe with Dark Purple Lines/Vines, Gold Chain print	36036pr0083	Dark Green	1×
Torso, Dark Purple Lines/Vines, Gold Chain print, Dark Green Arms, Black Hands	973c35h03pr0005	Dark Green	1×

Build DNA

Parts inventory insights for Rontu the Master Dragon

381 pieces puts this build -17% against the average Ninjago set and -40% against the average 2025 release.

LEGONINJAGO

Vs average Ninjago set

-17%-78 parts

This set381

Average set459

Average Ninjago set: 459 pieces across 408 other sets.

Vs average 2025 set

-40%-256 parts

This set381

Average set637

Average 2025 set: 637 pieces across 561 other sets.

Color profile

22different colors

Dominant color

Dark Purple

Dark Purple65x

17%

Black57x

15%

Dark Bluish Gray54x

14%

Dark Blue54x

14%

Unique parts

3.2 pieces per unique type

120

Repeat factor

Average pieces per unique type.

Most used part

Plate 1 x 2

21x

Results are based on official LEGO part inventories. Accuracy improves as you confirm set completeness.

This site is not affiliated with or endorsed by the LEGO Group.

Build Insights🧩120unique parts🎨22different colors📊17.3avg. parts per color🏆21×Plate 1 x 2

🎨 All Ninjago sets 📅 All sets from 2025

← Back to Buildable Sets