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Normally, when a wizard had gotten this far, progress would have become slow.
But!
That was for an ordinary wizard.
Noland Lee had used "Death Flight", following Nolin's guidance to locate these metal scraps.
He was eager to test his own reasoning ability and didn't immediately resort to Deconstruction.
"The Magic Circle's maximum width is 15 meters. Hmm, this is a medium-sized Magic Circle. Typically, a circle like this can't be operated by a single wizard, at least two assistants would be needed."
Noland crouched down, used [Mage's Hand] to brush aside the metal scraps, and observed the ground beneath the Magic Circle:
"When the magic metal chain conducted shadow energy, there was an extremely minor dissipation of shadow energy. This dissipated energy corroded the surface of the ground. The corrosion isn't extensive; it is only about two to three millimeters deep."