Flashback

As per Positron's Interview:

The second mission type allows players to travel into their own pasts by going to a place called the "Pillar of Ice and Flame". There, players will be given access to a list of things that happened in their pasts, both missions that they have already completed, and missions that for one reason or another were missed (I am told that they will be clearly marked either way).

In an interesting twist, players will also be able to set their own parameters for the missions, intentionally making them more difficult to complete. Completing missions with these parameters will earn players badges. The parameter options are as follows:

• Time Limit - Place a time limit on yourself to complete the mission.
• Number of "lives" - Place a finite number of "deaths" on the mission so that you can only try so many times.
• Make Enemies Tougher - Give yourself a challenge by making your enemies stronger.
• Put a de-buff on yourself - Give yourself a challenge by making yourself weaker.
• Can't use inspirations - Go through the mission with your inspiration "grayed out".
• Can't use Temporary Powers - Pretty self-explanatory, really.

These parameters can be mixed and matched (you can put more than one on at a time) and each parameter is a pass or fail on their own, meaning that you could manage to complete a mission in a certain number of lives while not meeting the time limit and still earn the badge for the former.

Story arcs in the past are able to be done either solo or in a group, but group play in story arcs is going to be treated like Task Force missions where players can't join mid-stream, and if you leave the team mid-way, you can not complete it.