For magicians operating in military forces, creating more potent spells has always been a priority. After the proliferation of firearms and other powerful, abundant weapons that even ordinary, non-magic wielding people could rapidly master, this issue has become even more pressing.
This is especially true for manipulative magicians. Unlike enhancement and transformation spells that can produce visible destructive effects, controlling others' minds and bodies is an extremely complex and delicate task. After all, compared to natural phenomena and one's own body, the human psyche is filled with uncertainty, thus demanding higher qualifications from the magicians.
