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I just checked – indeed, I was mistaken; they are Wizards of level 6. In general, all neutral creatures are quite clearly divided by levels (for example, a mummy is level 3, and a troll is level 5), and you can find out this level experimentally, for example, by casting spells that depend on the level of the creatures. You can read more about such things in the great work of FizMiG by Sir AmberSoler.