General Conditions (GEP)

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Due to the general lack of any solid "ground," spells that require a physical anchor-such as dig, Evard's black tentacles, move earth, and other spells that alter or affect ground or terrain-do not function unless cast upon quintesl sential or stable ether. In the case of quintessential ether, the spell. effect ends when the ether reverts to an ephemeral form, regardless of whether the spell in question has run its course. 'Course, spells cast upon stable ether last only until their duration ends. In addition, spells that mold a person's surrounding terrain-such as stone shape-suffer the same limitations.
Since the nature of the Ethereal Plane is flush with possibility and resists the imposition of a single (and therefore limiting) form, spells and magical items that break down matter-like the disintegrate spell-are more effective. A body resisting the effects of such things suffers a -1 penalty to all her saving throws. In addition, there is a 25% chance that polymorph spells and item effects misfire, transforming the target into a random shape.
Finally, a body should know that a sphere of annihilation (or any spell that mimics the effects of such an item) brought into the Deep Ethereal immediately causes the creation of an ether gap. In the instant of the gap's creation, anyone or anything within 300 feet is instantly sucked through the gap. Thereafter, the gap's effects occur normally, as detailed in the "Ether Gaps" section on page 23.