: A specialized version unlocked by completing the Shadow of Doom DLC on Ultimate difficulty. Story Walkthrough Chapters

: Spend Alliance Enhancement Points in the hexagonal grid to provide permanent stat boosts (Strength, Vitality, Mastery, etc.) to your entire roster.

: Complete the final trial in the Lambda Rift (after finishing the story).

While most of the 36+ characters unlock naturally through the story mode, four "secret" characters require completing specific trials:

: Complete the final trial in the Gamma Rift (after Chapter 5).

: Complete the final trial in the Psi Rift (after Chapter 7).