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Both expert Geo Mages knew how to cast Summon Boulder or Mound Spell, calling forth a giant rock to a predetermined location or making a mound appear at a specific site. They could control the softness of the mound as needed.
Zhao Tumei then piled the stones to form a series of solid bridge piers. Because they lacked the reinforcement of steel and concrete, this process had to be done with extra care.
It was better for the bridge piers to be thinner so the base wouldn't be too large and block the river.
Originally, both Geo Mages tended to pile up lots of rocks for reinforcement, but with Zhao Tumei around, things became much easier.
Using her precious sword 'Carrot', she cut the rocks like tofu, shaping them into the intended forms before planting them in the water. Afterward, the Geo Mages fortified them with spells, making them incredibly stable.
She then leveled the tops of the bridge piers to the same height.
