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3rd ed. rules
To use the shadow walk spell, you must be in an area of heavy shadows. You and any creature you touch are then transported along a coiling path of shadowstuff to the edge of the Material Plane where it borders the Plane of Shadow. The effect is largely illusory, but the path is quasi-real. You can take more than one creature along with you (subject to your level limit), but all must be touching each other.
In the region of shadow, you can move at a rate of up to seven miles every 10 minutes, moving normally on the borders of the Plane of Shadow but much more rapidly relative to the Material Plane. Thus, a character can use this spell to travel rapidly by stepping onto the Plane of Shadow, moving the desired distance, and then stepping back onto the Material Plane. You know where you will come out on the Material Plane.
Shadow walk can also be used to travel to other planes that border on the Plane of Shadow, but this requires the potentially perilous transit of the Plane of Shadow to arrive at a border with another plane of reality. The transit of the Plane of Shadow requires 1d4 hours.
Any creatures touched by you when shadow walk is cast also make the transition to the borders of the Plane of Shadow. They may opt to follow you, wander off through the plane, or stumble back into the Material Plane (50% chance for either of the latter results if they are lost or abandoned by you). Creatures unwilling to accompany you into the Plane of Shadow receive a Will saving throw, negating the effect if successful.
- Jonathan Tweet, Monte Cook, Skip Williams (August 2000). Player's Handbook 3rd edition. Wizards of the Coast. ISBN 0-7869-1551-4.