Telepathy [Mind-Affecting]
Level: Psion 6, Wilder 6
Display: None
Manifesting Time: 1 standard action
Range: Close (25 ft. +5 ft./2 levels)
Target: One creature/level
Duration: 1 minute/level
Saving Throw: Will negates
Power Resistance: Yes
Power Points: 11
You make yourself completely undetectable to the subjects by erasing all awareness of your presence from their minds. This power has the following effects.
First, you are invisible and inaudible to the creatures. They cannot even detect your presence by means of blindsense, blindsight, scent, or tremorsense. They cannot pinpoint your location by any means.
Second, the subjects remains unaware of your actions, provided you do not make any attacks or cause any obvious or directly threatening changes in the subject’s environment. For example, you could open a door and slip out without the subjects noticing, but if you opened a door and let in allies that the subjects can see, it would note the arrival of those allies. You could remove a hand-sized, unattended object from the subjects’ presence without risking notice, but moving a larger object or an attended object might end the effect (see below).
If you attack the subject creature, the effect ends.
If you take an action that creates a sustained and obvious change in the subjects’ environment—for example, attacking a creature aside from the subject or moving a large or attended object the subject can see—the subject immediately gains a new saving throw against the power.
Each creature is affected individually; it’s possible for you to cloud the minds of half a band of trolls, while the trolls that succeeded on their saving throws perceive you normally.
An ally of the subject creatures that is able to see or perceive you can use a move action to warn the subjects and thereby grant them a new saving throw.
Source: Expanded Psionics Handbook, page 84. Included edited text from the cloud mind spell.