Void Walk

As you cast the spell, you scatter fungal spores in a 10-foot diameter circle which rapidly grow into a fairy circle of dark black mushrooms.  You and any willing creature who enters the circle before the end of your next turn will be transported to The Void, a border region between the Ethereal, Prime Material, and Feywild. 

Time and distance are distorted by travel through The Void such that each hour of travel covers several times the distance in the Prime Material plane.   Terrain is a faint and insubstantial echo of the bordering planes, and travelers may move in any direction as if over flat and open ground. For each hour of travel in The Void, travelers will cover their move speed in miles.  A party of adventurers on foot, for example, will cover 30 miles in an hour.

While in The Void, travelers experience the Prime Material and Feywild worlds as faint and attenuated images viewed through a grey mist.  Creatures that are not in The Void cannot perceive or affect creatures within The Void, and creatures within the Void cannot affect the bordering planes and perceive them in to faint and jumbled a fashion to identify anything smaller than large geographic features. 

Upon reaching the intended destination you may repeat the ritual in The Void to return to either the Prime Material Plane or Feywild.  If you do not repeat the ritual by dawn of the next day, you and all who entered with you will be cast back unto the plane from which you entered and take 3d10 force damage. Your familiarity with the destination determines how accurately target your destination. When you leave The Void the DM rolls a d100 and consults the following table.  If you were forcibly expelled from The Void at dawn and had not reached a previous ritual site, re-roll results of 'On Target'.

Familiarity. "Previous Ritual Site" means a place where you previously cast the Void Walk ritual where the fairy circle it creates still exists.  If left unattended and undisturbed the circle will persist for 1 week.  If carefully tended (DC 10 Nature (Int)) that time can be extended. The check may be made once a week and extends the life of the circle for a week.

"Large or Very familiar" is a place you have been very often or have spent several weeks, or a major geographic feature such as a mountain or major city.  If targeting a large geographic location, the point of arrival within the target destination is random and at the DM's discretion. "Seen casually" is someplace you have visited more than once but with which you aren't very familiar. "Viewed once" is a place you have seen once, possibly using magic. "Description" is a place whose location and appearance you know through someone else's description, perhaps from a map.

On Target. You and your group appear where you want to.

Off Target. You and your group appear a random distance away from the destination in a random direction. Distance off target is 1d10 × 1d10 in miles. For example, if you rolled a 5 and 3 on the two d10s, then you would be off target by 15 miles. The GM determines the direction off target randomly by rolling a d8 and designating 1 as north, 2 as northeast, 3 as east, and so on around the points of the compass. If you were traveling to a coastal city and wound up 18 miles out at sea, you could be in trouble.

Similar Area. You and your group have mistaken the shadowy images of your destination and wind up in a different area that's visually similar to the target area. If you are heading for your home city, for example, you might wind up in a neighboring city or in the old ruins up the coast. Generally, you appear in a nearby similar place, but may sometimes at the DM's discretion arrive in a bordering area of the Feywild that echoes your destination. 

Mishap. You have arrived within a piece of terrain and are violently expelled out. Each traveler makes a DC 15 Con save or takes 3d10 bludgeoning damage and all are deposited in a 'Similar Area'.  Additionally, you may have drawn the attention of the formless creatures that dwell within The Void and despise mortal intrusion.  At the DM's discretion they may secretly roll a DC 20 Cha save.  If the save fails you will be pursued from The Void by one or more Invisible Stalker