Enemy in Disguise

Due to your untrusting nature, you have become a master in the art of deception, sleight of hand, and stealth. In time you have become excellent at lock picking, you can seemingly vanish into thin air, and are charming enough to make everyone believe your true intentions.

Observer's Gaze

Starting at 3rd level, due to this class archetype you gain an advantage for all perception and insight saving throws/checks, but in turn you gain disadvantage on all other types of wisdom saving throws/checks

Back-Stab

When you choose this archetype at 3rd level, you gain the ability to make attacks that are against enemies backs to crit and deal double damage

In addition, you are able to combine this ability with sneak attack and add an extra 1d6 for every attack that is dealt with a finesse weapon

Supreme Sneak

Starting at 9th level, you have advantage on a Dexterity (stealth) check if you move no more than half your speed on the same turn

Use Magic Device

By 13th level, you have learned enough about the workings of magic that you can improvise the use of items even when they are not intended for you. You ignore all class, race, and level requirements on the use of magic items.

Betrayer's Intuition

When you reach 17th level, you have become adept at sensing those around you and when they are trying to pull something sneaky in your prescence. You gain the ability to sense all those around you and because of this anyone within your range of sight suffers disadvantage on all stealth throws/checks