Cavorigen is one in the group of ætherines that was responsible for the anti-gravitational effect found in Cavorite. Cavorigen has the unique ability to block, redirect or negate the effects of gravity. Certain rare Earth elements after being imbued with quantities of cavorigen can retain its anti-gravitational properties for a time. Cavorigen is used in planetary æthercraft, ærial vehicles and grav sleds and sledges. The effectiveness of Cavorigen is easily disturbed by fluctuating ionic or magnetic effects which is why devices employing Cavorigen do not work on Venus.