Formless stalker

Most fear the dark for what may lie within it, but the followers of the god of shadows embrace such darkness, becoming one with the shadows and entering a immaterial realm of darkness. The Realm of shadows becomes your home and you seek the cold embrace of darkness. 

As one of his followers you can see in darkness as if it was bright light and has advantage in stealth rolls. If you are a Drow, you lose your weakness to sunlight and has your alignment changed to neutral good.

Shadow Step

Starting at 3rd level, you gain the ability to enter bodies of shadow as if a separate dimension, using this ability makes you undetectable if the one searching has no light source or darkvision. True sight is equally effective at detecting you, blindsight does nothing.

This ability counts as a full action if used in combat, but is to be considered as an instant success in a stealth check, after entering, you cannot attack for 1 round. Attacking from within it forces you out of it, but you attack with advantage.

While outside of combat, as long as you do not interact with the physical world, and is not detected by the previously mentioned conditions, you are to be considered in stealth.

Quick Footed

When you choose this archetype at 3rd level, you gain the ability to move faster than normal, your movement speed is increased by 10ft; climbing no longer costs you extra movement.

In addition, when you make a running jump, the distance you cover increases by a number of feet equal to your Dexterity modifier.

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.

Absolute Silence

Your body has become incapable of producing sound, provided your armor does not produce it instead. As long as you are not wearing armor, you can double your proficiency modifier for your stealth checks.

Total Darkness

When you reach 17th level, you have become one with the realm of shadows, allowing you to nullify any source of light, magical or otherwise, in an area of 50ft around you by making that space into a section of the realm itself. The area is to be considered absolute darkness, even if it is outside during the day, any creatures within the area is blinded and any creature outside it is unable to see past it. Darkvision and true sight DO NOT  bypass the effect, blindsight does bypass it.

Any creature within the area must make a, DC15 + your dexterity modifier, wisdom save or receive 6d12 psychic damage, receiving half that damage on a successful save.