Only the first 6 ? DR missions are dedicated to Magma . These missions deal with the basic moves of the game .
Once you start locating the other discs, you'll start the four character mission discs . Except for the character specific discs and the Nightmare challenges in the Legends level , those will also be solo missions .
Only a couple of the discs are really good for a major XP bump , but the ones with a secondary objective are good for equipment hunting and energy / health pack restocking . Once you complete a mission , you'll no longer get the equipment or pack drops , just XP .