Shinobi

You Focus your training on the art of shadows and the unseen. Choosing to wreathe yourself in obscurity, and to become faceless is an skill reserved for those who are willing to dedicate themselves to completing a task above all else; be it espionage, assassination, or theft.

Meld into Shadow

Starting at 3rd level, whenever you use your bonus action granted by your Cunning Action to hide, you can roll at advantage as long as you are in an area of dim-light or darkness, creatures that attempt to track you also do it at disadvantage. You gain darkvision out to a range of 60 feet, if you already have darkvision, your range increases by 30 feet. .

Additionally, you gain Spider climb speed equal to your half your walking speed at 9th level.

Slayer's Ambition

When you choose this archetype at 3rd level, whenever you deal sneak attack damage to a target, instead of rolling normal sneak attack damage, you can choose to upgrade the damage die for the sneak attack from D6 to D8. You can do this a number of times equal to your Dexterity or Strength Modifier. You regain all uses of this feature on a long rest.

This feature upgrades your damage die to D10 at 9th level, D12 at 13th level, and to 2d8 at 17th level.

Deadly Tenebrosity

Starting at 9th level, you know how to close the gap between you and your targets and how to make a quick escape. You can use your bonus action to teleport to one creature within 60 feet of you. Until the end of your turn, you have advantage on attacks against that creature and you gain the benefits of the disengage action.

You can use this feature a number of times equal to your proficiency bonus per long rest. 

Master of Disguise

By 13th level, as an Action, you can cast Alter Self and Disguise Self. While these spells are in effect, You can roll any Charisma checks made to pass yourself off as someone else at advantage. These disguises are considered non-magical for the purpose of bypassing true sight. 

Don't Blink

When you reach 17th level, at the start of each of your turns, you can choose to teleport yourself, or a teammate that you can see, up to your walking speed in any direction.

Alternatively, you can switch places with any willing creature you can see with this feature.