With the patch going out to Dark Legends today, item rewards for 3D missions in are getting a big buff! You can farm some of the best items in the game by replaying missions!
Here is an example:
Old Item Stats:
New Item Stats:
Loot improves as you level up. You can replay old missions for a chance to gain new, more powerful gear! Go back to your campaign map and check out the More Loot button to see what you can get!