Given that it is only allowed to "pure fae of considerable power" I think this is one of those things that was never really intended to be used by PCs in the normal course of affairs. It is more of a model than a carefully balanced power.
Yeah.
That is what I gathered.
Basically I was GM'ing the system, and had to set the game and learn it in a very short amount of time, because our main group GM was desperate for a break. So I told the group, pretty much, "Okay, I'm new at this, and still learning this system so things are going to be a little rocky." and the group was cool with it, it was just supposed to be a change of pace to give our main GM a couple of weeks off anyway. When the PC in question took the power we both missed the requirement, and the implications for some of the horrendously powerful things that the True Seeming was capable of.
At the time, my assumption that it worked like other veils and what not, made me consider "sure, okay, I can work with that" afterward the scrutiny of what the power was capable of and the ensuing deluge of questions regarding it however has prompted me to reconsider the power.
For those wondering my final decision was to strip the PC of the power, then allow them to re-spend the 4 refresh points as they see fit.
I figure that is more fair for everyone involved.
I'm not new to the pitfalls of GM'ing though, having done it for 22 years now, but again system familiarity was lacking in this case.
Thanks for the feedback all.