User blog comment:Linathan/Unit Spotlight: Obsidian Seraph Zenia/@comment-26053138-20150725175718/@comment-26140304-20150727002313

Well, she certainly had to exist for the story. Perhaps, it was a combination of bad timing as these units could've been released in place of the Popular Units rate up event. That way, more and more players would've had that hype back then because honestly, barely anyone summons during Popular Units rate up. At least we know that Zenia had to sacrifice herself to save the summoner and all of Grand Gaia from being dragged into the rift.