All magic attacks required a certain amount of time for chants, and more powerful magic would require longer time for the chants. The magus needed a perfectly safe environment to work because they had to concentrate on their chants, and so, they were an extreme class of their own.
They were like kings in long-ranged combats, but a weakling in close-quarter fights.
It was the first class that Shen Yanxiao had decided to abandon.
In a real battle, no enemy would allow the magus the time that they needed for their chants. Without the protection of powerful teammates, an unaccompanied vulnerable magus could be easily killed by a close combat class even if the opponent was lower-levelled. Of course, a skilled magus would require only a short time for his chant, and they could also torture those close combat enemies to death with their ample experiences.