From the dictionary:
Legerdemain: skillful use of one's hands when performing conjuring tricks.
In 5th Edition the Arcane Trickster Rogue subclass is provided with Mage Hand Legerdemain. This expands Mage Hand to be able to use thieves' tools, pick pocket, and other things typically attributable to the use of a "Sleight of Hand" check.
Mage Hand Legerdemain
Starting at 3rd level, when you cast mage hand, you can make the spectral hand invisible, and you can perform the following additional tasks with it:
- You can stow one object the hand is holding in a container worn or carried by another creature.
- You can retrieve an object in a container worn or carried by another creature.
- You can use thieves’ tools to pick locks and disarm traps at range.
You can perform one of these tasks without being noticed by a creature if you succeed on a Dexterity (Sleight of Hand) check contested by the creature’s Wisdom (Perception) check.
In addition, you can use the bonus action granted by your Cunning Action to control the hand.
My bard from the start was a "fast talking street hustler" with extra proficiency in Sleight of Hand and Deception. I generally use this combination for introducing myself with one hand and pick-pocketing with the other, but I recently discovered that Arcane Tricksters get the ability to do this with Mage Hand. That seems really fun but not really worth slowing my Bard progression for.
Would a custom feat that reads as follows have any serious game breaking repercussions?
Prerequisite: The Mage Hand cantrip
Your mastery over the illusional hand has granted you:
- Increase your Dexterity score by 1, to a maximum of 20.
- You can use your Mage Hand without being noticed by a creature if you succeed on a Dexterity (Sleight of Hand) check contested by the creature’s Wisdom (Perception) check.
- You can control your existing Mage Hand as a bonus action.