This feat correlates with the Hidden Blade magic item and the Assassin's Apprentice feat.

Your time in the creed has lent you some otherworldly experiences. Along with the manifestation of some abilities shared by higher ranking assassins. You gain the following benefits:

• Eaglevision, this ability allows you to know the location of most creatures within a 30 ft sphere centered on yourself. As an action you can use this ability. This ability lasts for 1 minute, and can be used a number of times equal to 1 x your proficiency bonus (minimum of 1) until you finish a long rest.
• You gain Expertise in Insight and Perception.
• You can cast Feather Fall, with no material components, at will.