I found these set listings on the LEGO Ninjago Wikipedia page. No citations or sources to be found. : r/Ninjago
LEGO Ninjago 71722 Skull Sorcerer's Dungeons - Lego Speed Build Review - YouTube
Ninjago Legacy LEGO: Two Epic Battle Sets - KAI VS SKULKIN & COLE VS GHOST | eBay
Skull Sorcerer's Dungeons 71722 | NINJAGO® | Buy online at the Official LEGO® Shop AU
NINJAGO® Toys and Gifts | Official LEGO® Shop US
Skull Sorcerer's Dungeons 71722 | NINJAGO® | Buy online at the Official LEGO® Shop AU
2021 LEGO Ninjago Legacy Sets (71737 71731 71732 71733 71730) - Toys N Bricks
![Ninjago 71721: Skull Sorcerer's Dragon [Review] - The Brothers Brick | The Brothers Brick](https://s3-us-west-2.amazonaws.com/media.brothers-brick.com/2020/06/LEGO-Ninjago-71721-Skull-Sorcerers-Dragon-Review-Cover-1024x536.jpg "Ninjago 71721: Skull Sorcerer's Dragon [Review] - The Brothers Brick | The Brothers Brick")
Ninjago 71721: Skull Sorcerer's Dragon [Review] - The Brothers Brick | The Brothers Brick
![BrickLink - Set 70723-1 : LEGO Thunder Raider [NINJAGO:Rebooted] - BrickLink Reference Catalog](https://img.bricklink.com/ItemImage/ON/0/70723-1.png "BrickLink - Set 70723-1 : LEGO Thunder Raider [NINJAGO:Rebooted] - BrickLink Reference Catalog")
BrickLink - Set 70723-1 : LEGO Thunder Raider [NINJAGO:Rebooted] - BrickLink Reference Catalog
Thunder Raider 70723 - LEGO® NINJAGO® Sets - LEGO.com for kids
Thunder Raider 70723 - LEGO® NINJAGO® Sets - LEGO.com for kids
LEGO Ninjago Sommer Sets 2020: Bilder und Infos
ninjago figure, action figure, upgradable action figure, lego ninjago set, collectible toy, lego ninjago character, ninja toy, 2in1 toys, golden lloyd, ninjago lloyd, ninjago minifigures, bone warrior – APPYTOYS
LEGO NINJAGO Epic Battle Set – Jay vs. Serpentine 71732 Building Kit (69 Pieces) 673419338998 | eBay
LEGO Ninjago Legacy (71733) Epic Battle Set Cole vs Ghost Warrior - NEW/SEALED 673419339001 | eBay
ninjago figure, action figure, upgradable action figure, lego ninjago set, collectible toy, lego ninjago character, ninja toy, 2in1 toys, golden lloyd, ninjago lloyd, ninjago minifigures, bone warrior – APPYTOYS
Best Way to Light Up Lego Ninjiago Skull Sorcerer's Dungeons 71722 – Lightailing
Journey to the Skull Dungeons 71717 | NINJAGO® | Buy online at the Official LEGO® Shop US
