The Rules
Dark Side spirits work the same as most characters, retaining most of the abilities and attributes it had when it was alive. Any attack that deals physical damage will not harm a Dark Side spirit, nor can a Dark Side spirit make direct physical attacks against living characters. Any Force powers with physical effects (ie, Alchemy, Telekinetic Kill, Injure/Kill, Accelerate Healing in Another, Telekinesis, Force Lightning, etc.) are ineffective when used by or against a Dark Side spirit . Any damage caused by these powers is reduced to zero. Dark Side spirits receive a +3D bonus on all Hide, Sneak, and Search rolls that they make.