User blog comment:B214/Question and Answers 6/@comment-220.253.133.221-20160806194106/@comment-9595671-20160807102422

For all we know it could be Trihexa again, while I know things from Ex have been proven canon like the Seven Satan system, not everything may be due to the fact it could reveal spoilers for the end of the series.

We won't know till it happens, all we know is that for this arc, Indra seems to be an antagonist.