Pact of the Claw (5e Pact Boon)
From D&D Wiki
Pact of the Claw
One of your hands turns into a claw of pure magical energy. This claw can act as your arcane focus. It can be used for a magical unarmed strike, which uses your Charisma modifier for its attack and damage rolls. The claw deals 1d6 force damage. This claw can also extend up to 15 feet. Through this feature, you can use your attack to cast any spell, invocation, or patron ability with a range of 5 feet or touch at any creature within 15 feet, and you can add the claw's damage to those effects.