There's no hell like Lego Ideas hell — “Watching the LEGO Nexo Knights on CN, I found out...
LEGO Book Cover with Nexo Knights Book Of Chaos (25288) | Brick Owl - LEGO Marketplace
Minifigure, Utensil Book Cover with Gold Circle with Spikes, White Smiling Skull, Dark Tan Highlights Pattern (Nexo Knights Book of Chaos) : Part 24093pb002 | BrickLink
Chaos Catapult 70311 | NEXO KNIGHTS™ | Buy online at the Official LEGO® Shop US