Other Considerations (CPsiH)

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Line of Sight: Unless the description states otherwise, psionicists require a line of sight to their target when using a psionic power.  Clairsentient powers are an obvious exception, as are many of the telepathic powers which list power score modifiers for targets which are outside the psionicist's field of vision.
Touch Attacks: Psionic powers with a range of "touch" can be used in combat, but they require a physical attack roll in addition to a power check to succeed.
PSPs and Unconsciousness: PSPs are an inherent energy in the psionicist; if a psionicist is knocked unconscious in combat (or for any reason), he does not lose any PSPs.  Of course, he may not expend any PSPs while unconscious, either. - Errata from Mr. Steve Winter