To use the shadow walk spell, you must be in an area of shadowy illumination. You and up to eight willing creatures who link hands in a circle are shifted to the border between the shadow realm and your adjoining plane. If the world you are on has no connection to the shadow realm, the spell fails.
In the region of shadow, you move at a rate of 50 miles per hour, moving normally on the borders of the Plane of Shadow but much more rapidly relative to the Material Plane. Thus, you 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.
Because of the blurring of reality between the Plane of Shadow and the Material Plane, you can’t make out details of the terrain or areas you pass over during transit, nor can you predict perfectly where your travel will end. It’s impossible to judge distances accurately, making the spell virtually useless for scouting or spying. When the spell ends, you immediately return to the plane you originated from in the spot you currently occupy. If you occupy the same spot as a solid object or creature when this happens, you are immediately shunted to the nearest unoccupied space that you can occupy and take force damage equal to twice the number of feet you are moved.
Shadow walk can also be used to travel to other planes that border on the Plane of Shadow, but this usage requires the transit of the Plane of Shadow to arrive at a border with another plane of reality. The transit of the Plane of Shadow requires 1d8 hours. If the spell duration expires while in the Plane of Shadow you remain there.
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 check, negating the effect if successful.
You can create a permanent link to the shadow realm by casting this spell in the same location every day for one year. You need not use the spell circle to shadow walk when you cast the spell in this way.
* - (a dark gemstone or mineral worth at least 50 gp)