Mechanus (PWH)

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Once a cutter's learned the dark of Limbo, he should forget everything he's learned and head for Mechanus. This is the home of law, order, and clockwork precision. It's also the home of the modrons, native beings that maintain and guard the plane and its workings.
The place needs such monitors, for the entire plane consists of a series of endless gears, forever turning and driving ... something. Some say the entire multiverse is driven by the gears; some say the cogs accomplish nothing. Someday a planewalker may discover the dark, but for now the gears simply tum.
The inhabitants of Mechanus make their homes on the very cogs that make up the plane. The gears don't normally have vegetation or native wildlife, but plenty of life thrives amid the machinery. The modrons control a place they call Regulus, which is home to the supreme modron, a high-up called Primus. It may be that Regulus is a layer unto itself, or just a realm. See, on Mechanus it's impossible to tell. It's one constantly turning clockwork, and the boundaries between layers (if any layers exist) and realms aren't always clear.
The modrons, as a canny basher might surmise, maintain a strict hierarchy. They're divided into well-organized ranks, each modron rank more intelligent and powerful (but fewer in number) than the last. Despite the modrons, the Guvners (and a few Mercykillers as well) like to feel that they run the show on Mecbanus.
A planewalker needs to know one more thing about the modrons, and that's the Great March. Approximately every 289 years as they measure them in Sigil (or 17 cycles on Mechanus), the modrons marshall a great host and leave their case to march around the Great Ring. No one knows why they march, especially since so few of'em live to see the end of the trip. Many planewalkers follow the march, however, since interesting things always happen as the Great March makes its way through the planes, realms, and gate-towns.
Surprisingly, within this realm of perfect law, a place or two exists for less orderly types. One such place is Haven, and while it's not a wild, chaotic town to most folks' eyes, on Mechanus it's an anarchic cacophony of disruption and lawlessness. The city appears to be a huge cube, walled on all sides, including above and below. In order to keep the neutral and chaotic visitors in town in check, they must have a sponsor from among the lawful permanent residents of the city. It's a good place for a planewalker to take refuge, if she can convince a sponsor to let her into the burg.
Tarsheva Recommends: In Haven lives a bard who, at one time, was a priest of Lathander. It's said that if given good reason, he'll call upon that power's abilities to help or heal those in great need for nothing in return.