Cranberry vs. Weiss Winterprsion's Walls

Clamberry thrust her fingers at Winterprison’s face; at the same time, Winterprison used her Magic. Her Magic was to “make walls”. The material of the walls varied with the locally available materials. In a quarry, she could erect stone walls.

A two meter-tall, one meter-wide and 30 centimeter-thick wall erupted from the ground, interposing itself between Clamberry and Winterprison. However, Clamberry’s strike easily pierced and shattered the wall, so Winterprison rolled backwards along the ground to evade the attack.

[...]

She built a wall; it was kicked down. She raised a wall; it was shattered. She erected a wall; it was leapt over. The walls that were supposed to be obstacles were completely useless. They could not even slow her opponent down.

It was not because the walls were weak. The walls Winterprison made were infused with the power of magic. While the structural material was stone, they ought to be stronger than steel. Yet even such sturdy walls were little more than wooden fences before Clamberry’s extraordinary arm-strength.

     - Magical Girl Raising Project