Copyright (c) 1996 by Michael Smith <msmith@mfi.com>

The Magestone is a small, opaque jem with twenty facets (ie, a
d20).  To activate the stone, a player simple rolls the dice, which
take one turn per roll.  For each roll, the GM takes an erasable
marker (wet, not dry) and colors in the face-up side.  Thus, the
stone has twenty charges and as the charges are used, it takes
longer (or luck) to get the thing to work.

When a non-shaded side is rolled, randomly roll to see which spell
is cast (this requires percentile dice with a d8 for the hundreds
column to represent both Magic and Grimoir, it also helps to number
every tenth spell in the spell index).  Whatever spell is rolled
is cast.  If the result doesn't immediatly make sense, the casting
is delayed untill it does.

Attempts to Analyze magic will slowly reveal every spell in the
books.  Detect Magic will all but blind the caster.

Make up whatever story you want to fit your background.  I left it
a total mystery, much to the consternation of my players.

Oh yes, the stone can be recharged by immersing it in a elyxir made
with any near-impossible, remotly magical substanse you can think
of (I required molten lava, one once of unicorn horn, three hairs
from a lactating elf, a gryffon's feather, one 50 pt. power stone
ground to fine dust, mythril dust, one pound of ground oak which
had been previously enchanted with Unbreakable, and a teardrop from
an ancient red dragon)