Hunk of Junk
Source
Interstellar Species pg. 127
You can appear to be a defunct piece of junk. As a move action, or as a reaction whenever you take damage, you can attempt to appear defunct. You immediately fall prone and attempt an Engineering check against each opponent who’s aware of you (DC = 10 + the opponent’s Sense Motive bonus, or 15 + 1-1/2 × the opponent’s CR, whichever is greater). Anyone you succeed against believes you’re useless mechanical junk and acts accordingly. An opponent who closely inspects you as a standard action can attempt an Engineering, Perception, or Sense Motive check at the same DC to uncover your deception. Maintaining this ruse is a full action each turn.
This trick can be taken only by characters who can be targeted by effects that only affect constructs, including those of the construct type and those with the constructed species trait.
ID
0e954f13131816331d8e1518