Thanks for this. I was waiting for this since you started with Force powers.
Wall of Light, which seems to be connected with Sever Force, but not completely the same, raises another interesting question: Freedon Nadds spirit was able to block Exar Kun's use of/connection to the light side. Could this be the dark side version of this power, something like Wall of Darkness? Or, at least, based on it?
I also remember a story in SWTOR about a Jedi who got cut off from the lightside of the Force by a Sith, forcing him to use the dark side instead. So it seems possible.