Citation d'une aide anglaise.
"This is a deceptive one. It does NOT unlock after completing the final boss battle and rescuing the damsel. There is an additional secret level you need to unlock, which you can do by collect all the chests in the goblin menace levels and collecting the pieces for a secret level map.
The Goblin Menace levels are:
The Heroes Return
Deadly Dustland
Belly of the Beast
Brackenridge Rise
Cloudy Isles and
Goblin Machinations
There are 2 chests in every level except Goblin Machinations. Goblin Machinations is the boss battle and has no chests or exp. Once you've unlocked the secret level, play through it (it's pretty easy) and once you reach the end there will be 2 cutscenes, Watch them and you will be deposited back at the main menu, where the trophy will unlock."
Donc en gros il y a un niveau bonus à débloquer en finissant les niveaux de Gobelin menace avec les coffres et les pièces. 'fin voilà je me fie à ce qui est écrit, je n'ai pas ce DLC.