Hoverstones

Hoverstones require attunement and are worth about 30.000 gp

They can be used for 48 continuous hours before switching off, ending all magical effects. After use they need a week to recharge.

The stones have immunity to attacks from non magical weapons.

While all can activate and attune to the stone, you need a DC 25 arcana check to properly use them.

If failed the stone and item attached to it will fly up untill the charge runs out, after which it drops from the sky.

A hoverstone can be put in the hull of a vehicle (or item, such as bolders) or worn on armor. It essentialy casts something similar to fly on said item or vehicle.

The max speed is 700 miles an hour, for a vehicle which has a hoverstone attached to it. This is not the speed for wearing the armor with a stone attached to it, this speed is currently unknown.

Dispell magic and anti-magic zones can stop the magic effects made by the hoverstones.