Lost Memory Fragments
This feature was a set of collectibles hidden throughout the newly added Mars destination for the Warmind DLC. Each collectible had a damage alignment and in order to collect the memory fragment you had to do damage to it with the damage type it was aligned to. Once collected it disappeared forever for that character. As the player collected the memory fragments, they would unlock different rewards that could be claimed at various locations in the game.
One tricky aspect of implementing these collectibles was making sure that every player in the shared space was able to shoot and collect the collectible and that shooting it didn’t destroy it for other players who were also trying to make progress on their mission.