Format:
cast 'tensors floating disc'            cost: 48 mana

   'Tensor's floating disc' is an upper mid-level mage spell.

With this spell, the caster creates the slightly concave, circular plane of 
force known as Tensor's floating disc (after the famed wizard whose greed and 
ability to locate treasure are well known).  The disk is three to six feet in
diameter an amount of weight dependent on the level of the caster.  The disc
floats 3 feet above the ground (when there is ground) at all times and remains
level.

If unguided, it remains in one spot and does not drift.  When the spell
expires, the floating disc winks out of existance, and whatever it was
supporting crashes to the ground.