Cloud Mind(Expanded Psionics Handbook, p. 84)
Telepathy [Mind-Affecting, None]
Level: Psion 2, Wilder 2,
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature
Duration: 1 min./level
Saving Throw: Will negates
Spell Resistance: Yes
You make yourself completely undetectable to the subject by erasing all awareness of your presence from its mind. This power has the following effects.
First, you are invisible and inaudible to the creature. It cannot even detect your presence by means of blindsense, blindsight, scent, or tremorsense. It cannot pinpoint your location by any means.
Second, the subject 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 subject noticing, but if you opened a door and let in allies that the subject can see, it would note the arrival of those allies. You could remove a hand-sized, unattended object from the subject's 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 subject's 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.
An ally of the subject creature that is able to see or perceive you can use a move action to warn the subject and thereby grant it a new saving throw.