I think Star Legends is the official name of the game with the Blackstar Chronicles being the first 'episode' of the game, likely there will be other episodes.
Blackstar being the first stage of the storyline where the 'Blackstar' (Scorn and Riven alliance) eclipses our (Human and Mode) own Star (Kinda like the Spacetime Studios logo). Thats my take on it so far.