Creatures or objects that are phased—that is, in the Border Ehtereal Plane—can be detected by using this spell.
The spell affects a path 60 feet long and 10 feet wide; any phased creatures or
objects in this area are revealed as soft, blue-glowing outlines visible to
anyone in the vicinity. Creatures or effects detected by this spell include: phase
spiders, ghosts in their ethereal state, characters or creatures employing oil of etherealness, psionic etherealness or phasing, and all other similar effects. Doorways or
portals to extradimensional spaces are also detected, although anything hidden
within remains unseen.
Detect phase does not reveal the location of creatures or objects concealed by magical
invisibility or illusions. Note that detecting a phased monster doesn’t necessarily
give the caster the ability to attack it, but creatures such as phase
spiders lose any special surprise bonuses they may receive if they are
detected by using this spell.
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