Cube of Force

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Enc.:
IS: bone OR
gem
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XP: 3k
GP: 20k 
Miscellaneous Magic
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Magic Items
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DMG

A device of but about the size of a large die - perhaps 3/4 of an inch across -- the cube of force enables its possessor to put up a wall of force 1" per side around his or her person, and this cubic screen is impervious to the attack forms shown on the table below.

The cube has 36
charges, and each day this energy is restored. The holder presses one face
of the cube to activate or deactivate the field:
 
Cube 
Force
Charge Cost per 
Turn/Movement Rate
Effect
one 1/1" keeps out gases, wind, etc.
two 2/8" keeps out non-living matter
three 3/6" keeps out living matter
four 4/4" keeps out magic
five 6/3" keeps out all things
six 0/normal deactivates

When the force screen is up, the following attack forms cost extra charges
from the cube in order to maintain the integrity of the screen. Note that
these spells cannot be cast either into or out of the cube:
 
catapult-like missiles 1
very hot normal fires 2
horn of blasting 6
delayed blast fireball 3
disintegrate 6
fireball 3
fire storm 3
flame strike 3
lightning bolt 4
meteor swarm 8
passwall 3
phase door 5
prismatic spray 7
wall of fire 2

The cube of force can be of any hard mineral, ivory or bone.
 

WSG: If cube face five (“keeps out all things”) is activated,
anything inside the cube is immune to damage from a fall
or a tumble.