Ghoulish Affinity

As a child, you somehow got your hands on a lurid, forbidden text. You studied the details within intently, learning much about extraplanar undead from beyond this reality, and you developed a strange, almost macabre way of thinking because of this book’s influence.
  Benefit: You gain a +2 trait bonus on Perception checks to notice Undead disguised as living creatures, and a +2 trait bonus on Fortitude saves against diseases and poisons inflicted by Undead.