You are sensitive to the flows of mystic energy through the world.
Prerequisite: 5 ranks Spellcraft
Benefit: You may make a Spellcraft check in place of a Perception check to notice spells, spell effects, magic items, and creatures of the aberration, construct, dragon, fey, outsider, and undead type. If you beat the required DC to notice something with Spellcraft by 5, you learn what category of thing you have sensed (including its type if it is a creature).
Adventurer’s Handbook: Genius Guide Volume 1