Mythallar of Ythryn

A mythallar looks like an enormous crystal ball held in an ornate cradle. The globe, when active, sheds bright light in a 300-foot radius and dim light for an additional 300 feet. The globe can be harnessed for various purposes related to environmental control of the surrounding area.. For example, mythallars can be used to keep complete cities aloft and alter weather conditions for the surrounding miles. The bigger the mythallar, the more magic it can hold.

The Ythryn mythallar is a mere 20 feet in diameter. To attune to this mythallar, a creature must meditate on the mythallar for an hour. Up to eight creatures can be attuned to it at one time. If a ninth creature tries to attune to the mythallar, nothing happens.

Mechanics & Inner Workings

All creatures attuned to the Ythryn mythallar can sense when the device is being used. A creature attuned to the device can use any of its properties, but only if all other creatures attuned to the device agree to allow it. The Ythryn mythallar's properties are as follows:

While a user is within 50ft of the Ythryn mythallar, a user can use a full-phase action to cause it to fly in any direction at a speed of 10". All matter within 500 feet of the device moves with it. The Ythryn mythallar and all structures held aloft by it hover in place when not in motion.
You can use the Ythryn mythallar to cast the Control Weather spell without requiring any components and without the need for you to be outdoors. This casting of the spell has a 50-mile radius. For the duration of the spell's casting time, you must be within 30 feet of the Ythryn mythallar or the spell fails.

History

The Mythallar of Ythryn once held the city of Ythryn aloft, and suspended 250 feet above the surface of Kalte . Following, The Fall of Ythryn , the Mythallar fell dormant. It remains dormant to this day.