Trading/game cards. One in each box.
Pamphlet inside each box:
Original Lego figure: [image from Bricklink]. It's 100% the same:
Each of them will come with one of this thing.."Skreemers"
2. Evil Green Ninja
4. Scythe Master Ghoultar
5. Bow Master Soul Archer with Ghost Legs
6. Ghost Warrior Cowler with Scabbard
Decool actually manage to copy this new part. It's not printed. The part is made from a mixture of two colors of plastic. Love the colors :)