Sarius' Temporal Demi-Plane
(Conjuration, Evocation)

Range:  10 yards per level
Components:  V, S, M
Duration:  1 hour per level
Casting Time:  1 turn
Area of Effect:  Special
Saving Throw:  None

This spell uses the magical forces of the astral or ethereal planes to create a small demi-plane. This demi-plane is connected to the current plane of the wizard through a special (10?10 feet) gateway which is invisible to all creatures except the wizard unless they are able to use true seeing. When cast, this spell causes astral or ethereal stone to form into a 10-foot cube. This cube houses the physical structure of the demi-plane, but the interior is a distorted dimensional area with a volume equal to 10 cubic feet of space per level of the wizard. In its drab, grey interior, the demi-plane is governed by the physical and magical laws of the plane in which it is created (astral or ethereal), but does have a localised gravity which is under the control of the wizard (normally equal to what the wizard is used to at the prime material plane but it may be lowered all the way to 0 G at a rate of 0.1 G per round).
There is no need for air or nutrition since characters are governed by the normal astral or ethereal laws. The wizard may change the interior form, but may not decrease or increase the volume of the demi-plane. Volume form is changed in 10 foot cubic blocks, and it is impossible to make any area smaller than 10 cubic feet, though, pits and similar obstacles can be created. Also, the normal temperature in the demi-plane is 68 degrees Fahrenheit and may not be changed.
A wizard must touch someone for them to see and enter the gateway, but, once inside, anyone may freely exit the demi-plane. If someone is able to see the gateway through the use of true seeing, and he is a wizard familiar with the wizard lock or temporal demi-plane spells, he may attempt to enter the gateway by using his willpower to negate the need for the casting wizard's touch. In game terms this means a successful percentile roll with a base 50% chance modified plus or minus 5% for every difference in level from the wizard in an upward or downward progression, respectively. A wizard seeing the gateway and meeting the stated prerequisites will automatically know that this is possible. Otherwise, only spells of a wish-like nature will be able to discern the entrance, though creatures with senses that extend into the astral or ethereal planes will be able to see the large block of stone that makes up the external surface of the demi-plane area and psionic characters may be able to use probability travel to gate into the demi-plane if they are familiar with it.
The demi-plane does not allow access to the astral or ethereal planes unless it is destroyed, or if the wizard creates the demi-plane while on one of these planes, in which case the entrance to the demi-plane is actually entered on the plane in which it resides and not a connecting outer or elemental plane. When the spell is initially memorised the wizard must determine whether he will cast the astral or ethereal variant of this spell. It is impossible for both to be used in the same area of effect (on the prime material plane) due to conjugations of magic energies required in maintaining the spell.
The structure containing the demi-plane is able to withstand 3 HP of structural damage (versus hard stone) before it is disrupted. The ethereal cyclone will inflict 1d100 HP of structural damage every time it passes over the area of the demi-plane and the psychic winds of the astral plane automatically inflict damage equal to half the current structural hit points of the demi-plane's shell. The nature of the demi-plane causes it to stay in one spot so it may be used as a reference point if the spell duration is long enough (through the possible use of a permanency type spell). But, no matter what spells are applied to the demi-plane, it will always disrupt when its structural hit points are brought to 0 or less. The contents of the demi-plane are then thrown into the plane of creation and all creatures must save versus spell at -6 or be knocked unconscious for a period of time equal to one hour of time on the plane in question (not subjective time). If cast on the ethereal plane the spell duration is extended by a factor 10 and on the astral plane the duration is extended by a factor 1000. The material component of this spell is a miniature platinum ziggurat embedded with peridots and having a finished value of at least 1000 gp. The ziggurat must weigh at least 5 ounces.

