"As far as I remember, in the original version (including 1.6), only the Warlock, Knight, and Wizard had the "Secrets of Light" skill. Later, in some version (I think it was an add-on with orcs), they made a major overhaul of the skills and gave many skills to everyone, but the original version remained unchanged.
Take a closer look at the skill wheel specifically for the original version of the game. The skill wheel for versions 3.0-3.1 or 2.0-2.x is completely different and doesn't apply.
By the way, Faidaen cannot take the super ability in the original because he starts with the "Tactics" skill, which blocks access to the super ability."
I have patch 1.6, so it's impossible to reach SA because they don't give "Secrets of Light" yet? And what does tactics have to do with it?