Niv - Planar Beacon info

         The placement of the Planar Beacon had been dictated by the complex metaphysical geography of Ravnica, the same currents of energy that had powered the Implicit Maze. There had only been a few places that were suitable, according to the plans Niv-Mizzet had provided, and only this one, an Azorius outpost and skyship dock, had a ready-built tower of the requisite height. Isperia had consented to an Izzet crew moving in and taking over the top floors of the tower, constructing the great machine to the Firemind's specifications.

          Building the beacon had been part of Ral's assigned tasks, but he'd left it to subordinates for too long, busy as he'd been coordinating the guild summit.

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          When you assigned a task to the chemisters of the Izzet, you usually only had the vaguest idea what you were actually going to get. In this case, Ral was pleased to see that they'd stuck fairly closely to Niv-Mizzet's design, with only a few decorative touches added on. The center of the beacon was a single metal stool, with a half-circle of steel control board curved around it, covered with an array of switches, buttons, and dials. A series of ivory keys, like a section of a piano keyboard, occupied the center. Wires curved away, up to the ceiling and out to the machinery between the domes.

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The Gathering Storm, Chapter 8