Vampire

Some rogues like to take their natural ability to blend into darkness to a whole new level. These rogues become vampires; the stalkers of the night. In order to choose this subclass, you must first become a vampire.

Vampiric Bite

Starting at 3rd level, as an attack, you can seep your fangs into a victim's neck, restoring your health and draining theirs. The target takes 1d6 piercing damage and you regain your rogue level of hit points. You can use this attack at any time but can only use it to restore health once per short or long rest.

Vampire's Darkvision

When you become a vampire at 3rd level, you gain Vampire's Darkvision, if you already have a form of Darkvision that is less powerful, replace it with this.

Vampire's Darkvision works like normal Darkvision, its distance is 120 feet. However, you also gain advantage on all perception checks made in dark or dim light.

Blend with Night

Starting at 9th level, you are so at home in the darkness that you have advantage on all Stealth checks made in dark or dim light. 

Spider Climb

Your vampric powers are becoming stronger. At 13th level, you are able to cast Spider Climb at will like a cantrip. Your spellcasting ability modifier for it is Intelligence.

Misty Escape

When your current hit points drop below half of your maximum hit points, you have the ability to change into a cloud of mist. While in this form, you can't take any actions, speak, or manipulate objects. You are weightless, have a flying speed of 20 feet, can hover 20 feet off of the ground, and can enter a hostile creature's space and stop there. In addition, if air can pass through a space, you can do so without squeezing. If you try to pass through water,  you return to your original form. You have advantage on Strength, Dexterity, and Constitution saving throws, and are immune to all nonmagical damage, except the damage you take from sunlight. You can remain in this form for two rounds. This ability uses an action. After using this ability, you can't do so again before taking a short or long rest.