An acolyte, a freedom fighter, or just a new and green adventurer could go in this class. Members of this subclass use sneaking, trickery, and spellcasting to do what they wish. 

Mage hand mastery

At the third level, you gain the ability to manipulate a mage hand with stunning skill. You can now pickpocket items from a container a creature may be holding, place items into one in a similar fashion, and lockpick locks all with ease with your mage hand.

Electricity and acid

When you achieve level 9, you gain Chain lightning and Streams of acid as cantrips. You can now roll two d8 when your weapon hits to channel extra damage of the types Acid or Lightning through your weapons. You cannot deal 2d8 of Lightning damage and 2d8 of acid damage with the same weapon when using this feature.

Master of invisibility

Your magical prowess has give you the power to vanish without trace at anytime. You start with 5 charges that can be replenished after a short rest, but at level 16 those charges become infinite.

Master of silent death

An extremely deadly skill that allows you to kill a creature of your size and one higher. You must roll a d20 + your dexterity score. If you score higher than the creature's armor class, they die, and you will remain hidden afterward. If your DM says that character cannot be killed, their hp is reduced to what would happen if you landed a critical hit, and you will still remain hidden.