Tenser’s Floating Disc

With this spell, the caster creates the circular plane of null-gravity known as Tenser's Floating Disc after the famed wizard of that appellation (whose ability to locate treasure and his greed to recover every copper found are well known). 

The disc is concave, 3-ft in diameter, and holds 1,000 g.p. weight per level of the magic-user casting the spell. 

The disc floats at approximately 3-ft above the ground at all times and remains level likewise, it maintains a constant interval of 6-ft between itself and the magic-user if unbidden. It will otherwise move within its range, as well as along with him at a rate of 6", at the command of the magic-user. If the spell caster moves beyond range, or if the spell duration expires, the floating disc winks out of existence and whatever it was supporting is precipitated to the surface beneath it. 

The material component of the spell is a drop of mercury.

The caster cannot ride on the Disc. The Disc always follows the magic-user.