Without any martial abilities, they were very weak. Because so far Wizards have only relied on Spells and Mana to fight. However, that doesn't mean that none of them have martial arts abilities. There are some magicians, but not many.
Mana and spells are inseparable units for wizards. Especially for those who are still at levels one and two.
Different from Fu Xie Lan, ever since she could use a wizard's mana, sometimes spells popped up in her mind, those spells coming from nowhere. Fu Xie Lan felt neither strange nor awkward because for some reason she felt as if she was used to these things. And that was why the girl was able to use the wizard's mana without learning the spell first.