You were, or are, possessed in some way by another entity that grants you occasional access to its knowledge.
Benefit: Once per day, you can attempt a Knowledge check of your choice even if you are not trained in that skill and it is not usually possible to use that skill untrained. If you can normally use that skill untrained, you gain a +2 trait bonus on the check.
Pathfinder Roleplaying Game: Ultimate Campaign. © 2013, Paizo Publishing, LLC; Authors: Jesse Benner, Benjamin Bruck, Jason Bulmahn, Ryan Costello, Adam Daigle, Matt Goetz, Tim Hitchcock, James Jacobs, Ryan Macklin, Colin McComb, Jason Nelson, Richard Pett, Stephen Radney-MacFarland, Patrick Renie, Sean K Reynolds, F. Wesley Schneider, James L. Sutter, Russ Taylor, and Stephen Townshend.