You can win multiple rewards including rare items and hard to find collections when starting or helping on a mission.
If the mission is successful all members of the mission crew will be handsomely rewarded with the leader of the mission getting a slightly bigger piece of the pie.
Rewards will be adjusted frequently for missions making it worth playing the same mission over again. Rewards are displayed as common, uncommon, and rare.
Hovering over the image of the item will show the full item description including any attack and defense values.