The Bringer of Night
Very powerful anti gravity stone used in air-ships
This material of unknown origin is a very powerful anti-gravity device. A piece the size of a pig is enough to allow a full sized galleon to float in mid-air. It must be moored very securely as it accelerates very quickly and within seconds can be moving fast enough to smash through wood metal or stone.
“It is ironic that the name given to this substance is ‘lightstone’. In reality the stone is very heavy indeed but it is not of this earth. It is a wanderer from another world. Just as with earthly materials, the heavier they are, the more insistent earths grip on them, the heavier the wanderer, the faster it is pulled back towards it’s home” :- Cassius Biloxis Drissus – Alchemist to Emperor Maxus III