The spell creates an accessway through wood, earth, stone or other "natural" material. The material is not displaced or "disappeared"; rather, a door is formed which may be swung open. The door may have at most a volume of SI (MS) or SIx3 (CS) cubic feet. It cannot be detected by mundane means.
The door created cannot be opened by physical or mundane means. A person must first attune to it (see Tome of the Shek-Pvar 33); manual attunement is tested against Aurax2. After attuning, the opener must test against Willx5 - 10x(Lock CL) to open the door. (Note: the creator of the portal may use a personal key spell such as Caladan's Key to open it.) The "lock" Complexity Level is specified at time of casting and may be lower than or equal to the caster's Portal SI.
If the door fails to open, the opener must re-attune before he can again attempt to open it. If opening is successful, the door will swing slowly shut and re-lock after 30 seconds, although it may be easily pushed shut and locked in less than that time. Preventing the door from closing requires a successful test against Strength+Will by any one person who is attempting to hold it open, every ten seconds that the door is held open.
ML76+: Caster may specify that the door open on its own when a specified condition taking less than fifteen words to describe is met (e.g., "when struck by the light of the sun on the summer solstice").
Fatigue: (15 - SI)x3.5
Time: (15 - SI)x4 minutes
Range: Touch
Duration: Indefinite