Thin Planar Barriers (5e Hazard)

Thin Planar Barriers

The barriers separating the planes of existence wax and wane depending on where one happens to find themselves. At the nexus of thin planar barriers, the effect is so thin that someone could accidentally slip over to the other side. The DM can choose which two planes share this anomaly, such as the Material Plane and the Astral Plane, or the Elemental Plane of Fire and Limbo. As with many other transplanar anomalies, aspects of both planes tend to seep through to the other side, such as an area bordering the Abyss showing signs of demon creep or an area bordering the Shadowfell absorbing unnatural amounts of ambient light.

Thin planar barriers are a spherical field of effect that can range from one to a hundred miles in diameter. Within this sphere of influence, several effects take place:

Spells and other effects that send the caster to another plane, such as plane shift, do not expend a spell slot, and instead teleport the caster to a random location on the other plane within the area of the thin planar barriers on the other plane.
Whenever a creature passes into or through the area by means of teleportation, such as by an innate ability or a spell such as dimension door or misty step, they must make a DC(14) Charisma saving throw. On a failure, they are instead teleported to a random location within the area of the thin planar barriers on the other plane.
Spells and other effects that send creatures to other planes of existence, such as plane shift or banish, will instead send them to a random location within the area of the thin planar barriers on the other plane.
Spells and other effects that link to a particular location, such as teleportation circle or gate, instead link to a random location within the area of the thin planar barriers on the other plane.
If a spell or other effect would teleport a creature from another plane to your position, such gate, it instead targets a random creature within the area of the thin planar barriers on the other plane. If no such creature is available, the spell fails.
Spells and other effects that would initiate contact with creatures on another plane, such as contact other plane, do not expend a spell slot if the recipient is located within the area of the thin planar barriers on the other plane.
Spells and other effects that would prevent a creature from leaving the plane, such as magic circle planar binding, are immediately suppressed and dispelled upon entering the bounds of the thin planar barriers.

Multi-intersection. On rare occasions, more than one plane can rub against one another in the same spot. In circumstances such as these, whenever the effects of thin planar barriers would send a creature to another plane, roll a die based on the number of planes to determine which plane they are sent to, such as rolling 1d2 to determine to which of two planes to send a creature.

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