Other than her offensive magic with the lightning element, Tatsumi was also a genius when it came to making barriers. She had a special talent which allowed her to control the barriers extremely precisely.
Because of this, not only her barriers were stronger, they actually even needed less mana than normal. And as she was able to perfectly deploy the barrier exactly where it needed to be, she was basically a walking fortress capable of protecting a lot of people at the same time.
Obviously as she was just a rank 3 magus, the strength of her barriers had a limit. Any rank 4 powerhouse was capable of easily breaking it.
But all the rank 4 bandits were busy with their opponents. So there was no one who was capable of constantly break her barriers. And this was the main reason why the number of deaths among the weaker adventurers were still under control.
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