For future reference, when you create a new thread state more explicitly what its subject is. Calling it "legendary" is too general and not very informative.
The scheme asks you to use 6 heroes instead of 5 if I remember correctly. You take them from the box. Heroes are Storm, Wolverine, etc. Instead of making a hero deck made of 5 heroes, you have to add a 6th hero, irrespective of the player count (normally you only add a 6th hero in 5 player games).