The Apprentice is a Magician tier 2 Slow infantry unit in Symphony of War. While they can pack a punch with their single-target magic attack, ultimately the aim is to rank them up into a better Tier 3 class. When it comes to classes, its in general better to unlock the apprentice training technology over promoting fighters and bowman to this rank, as these units will have a significantly lower magic score at the start. If starting with a tier 1 class for a mage, then consider doing this at the lower lever, in order to give the unit more levels to gain magic.
Regarding traits, there are the following options:
