You can place a magical hex on your targets, making them easier to stalk.
Benefit: By taking a full-round action you are able to discreetly place a magical hex on any target within 30 ft. This hex takes the form of your personal mark or guild mark, and must be placed somewhere on the body of the target that is visible to you. The mark persists for 24 hours and cannot be removed or dispelled. You may add your Intelligence bonus to any Perception and Stealth checks made against a creature you have hexed. In addition, you are able to sense the direction of the hexed creature as long as it is within 1 mile per level of assassin you possess. This ability otherwise functions as locate creature, and your caster level for this effect is equal to your character level.
Undefeatable: The Collected Feats Sourcebook, Copyright 2009 – 2010, Louis Porter Jr. Design, Inc. Undefeated, Copyright 2011, Louis Porter Jr. Design, Inc.