Vigilant Shadow

Beginning at 3rd level, you can give yourself a bonus to your initiative roll equal to your Wisdom bonus after you have seen the results of the initiative roll.

You can use this ability once between short or long rests.

Dread Ambusher

Also beginning at 3rd level, you gain darkvision out to a range of 60 feet. If you already have darkvision, its range increases by 30 feet instead.

Also, the first time you hit one of your favoured enemies on your first turn in combat, that creature must make a Wisdom saving throw if it has not had a turn in combat yet. The creature has disadvantage on this saving throw if it is surprised. On a failed saving throw, the creature is frightened of you for 1 minute.

The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a successful save.

Dread Slayer

Beginning at 9th level, you become the enemy your enemies fear. Once per turn when you attack a creature that is frightened, you have advantage on the attack roll and if the attack hits, you can immediately make another attack against that creature.

When you reduce a frightened creature to 0 hit points, you can use your reaction to force one of your favoured enemies that you can see within 120 feet of you to make a Wisdom saving throw. On a failed save, the target is frightened by you for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a successful save.

Veil of Shadows

Beginning at 17th level, when you are in an area of dim light or darkness, attacks against you have disadvantage.

You also know the darkness spell and can cast it without expending a spell slot.