Planar Protections (PWH)

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Ever more common in the bazaars of Sigil are items crafted to deal with the conditions of one particular plane, rather than a multitude of conditions. These items often carry a significantly lesser cost than their multiuse counterparts. For example, a ring of Gehennan fire resistance protects a body against the lava, magma, and heat of Gehenna—and only Gehenna. It has no effect on the Elemental Plane of Fire, a red dragon's breath, or the volcanos of Muspelheim on Ysgard. 'Course, the ring won't stop a body from being physically shoved over the side of one of Gehenna's mountains by a lava flow—but that's another problem for the planewalker.
Similarly, wizards in Sigil create items specifically for use on the Inner Planes. Instead of relying on multilayered spells for breathing, protection, and movement on an Elemental Plane, a traveler might instead choose to purchase an item—usually an amulet—which provides those necessities. These items are also useful only on a single plane, having the essence of that plane infused into them at the time of their creation. These amulets usually function for only a week (6 + 1d4 days) once activated, "burning out" and becoming useless after that.