I noticed that Legion and Sphinx are getting updated power tiles in this expansion. Why is that?
In the base game, Sphinx gives you a square VP.
As Seth can only get combat VP (and can purchase this tile), we choose to change the Sphinx and give him (much) more strength.
During our playtests, it seemed that Legion (which is already a very strong tile) was op for the alliance; especially when the alliance is composed of many players.
So we decided that Legion will work with only one player.
Hope that answers your question.