You cannot get it anymore, I think. It used to be obtainable from PoxPortal and you would also get it from SOE by attending their event. The other option is to get it from someone.
It's possibly the rarest rune in the game. I believe it was given out during only 1 Fan Faire and only to attendees. It's possible that it could be a LEG that you can get from Core packs, but I doubt it. http://poxpalace.blogspot.com/2014/03/poxnoras-1st-soe-fan-faire.html
is there any way to find out when u got a rune? I have this spell and I think I got it by chance recently when buying a pack. Did not know what it was until recently...
Yeah, Fan Faire has been hard to get for quite a while now.. I don't even remember when I picked mine up. The trick is finding someone who is not only willing to part with it, but part with it at a reasonable price.