This is a set including a Ninja's Proof medal, awarded for solving a puzzle at the LEGOLAND Ninjago 15th Anniversary event, and a limited-edition factory block featuring Kai, given with purchases at select LEGOLAND stores. Both items are exclusive to the Ninjago 15th Anniversary event and are limited in quantity, so they are expected to be quite rare. LEGO LEGOLAND Minifigure Ninjago Kai Ninja's Proof Medal Block Limited Edition