ETHEREAL
Ethereal creatures and objects are present in two planes of existence simultaneously. They can see both planes and gain the benefits and suffer the detriments of both planes' environments simultaneously. They are treated as incorporeal and invisible on one plane and corporeal and visible on the other. They can toggle their corporeality relationship with the planes as an action on their turn. Unless noted otherwise, an ethereal creature is incorporeal on the material plane and corporeal on the the other plane indicated by the effect that made them ethereal. While ethereal, a creature has twice the normal chance of running into random obstacles and encounters (since they could appear on either plane).