Form the introduction:
You are the student of a powerful necromancer. Trained since a very young age himself, he has accumulated a great wealth of knowledge, and a repository of grimoires, tomes, and other treasures over his lifetime. For the last two decades, he has been training you in the multitude of necromantic schools he has mastered.
So far your training has been kept generalised, free from a singular field in which you excel to the detriment of others, meaning for the moment you are a jack-of-all-trades; at least until you venture out on your own as a journeyman. Only then will you choose one field above all others to which you will devote your time, effort, and resources.
He is old now, and reluctant is he to enhance himself or force an unnatural conclusion, and thus he relies greatly upon your youthfulness as well as the creations he has crafted and the servants he has raised over his lifetime.