Mana Sensing / Invisibility

Jace passed out of Azorius territory. With his magical senses he could perceive the flow of mana that marked the maze’s path, channeling like a midair stream down the center of the Azorius zone. In the Azorius area, the stream of mana followed the shape of the streets closely, and Jace was able to move quickly to follow its path. Up ahead the path led out of Azorius territory through an elaborate checkpoint. Some two dozen people were backed up at the checkpoint as the Azorius guards tried to verify permits. Jace cloaked himself in a blending spell, silently thanking the Azorius for employing guardians who had minds he could easily affect, and slipped through the checkpoint.

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Dragon's Maze: The Secretist Part 3, Chapter 8