As far as I can find, that spell is a lvl 58 one. This means you no longer automatically receive it, best bet would be the broker to find an adept version or higher, if the prices permit it anyway.
I do believe you can get an apprentice version of it in Maj'Dul, once you gain enough faction with one of the three houses so you get access to their hall. There are vendors there that sell all sort of things, I believe some spells too.
But best and fastest way would be the broker!