If I recall correctly, taking this skill once (and burning a Magic Tome in the process) would also grant one level in Flight of Zimmerman. It says so on the wiki (Fandom). I just leveled up my Marienburg Captain, and took this skill. But I got no spell at all, not even Luck of Shemtek. Is this the new normal? The skill was nerfed? If so, I'll edit the wiki accordingly.