Nevertheless, dark magic is the most effective in fighting against opponents who outnumber you several times over. Just one mind control spell with vampirism is worth a lot. The only problem is that I couldn't find any.
That's not good. It turns into "The Adventures of a Necromancer."
Added 3 minutes later
And yet, it's a common practice.
For lazy players, yes. But if the enemies include monsters that are immune to this magic, it's useless.