Eldritch Invocation: Union of the Talisman

Prerequisite: 15th level, Pact of the Talisman feature

While someone else is wearing your talisman on the same plane of existence as you, you can communicate with each other telepathically. Additionally, while on the same plane of existence, you can make any spell you cast that targets only you also target the wearer. This benefit, however, can be used a number of times equal to your proficiency bonus, and all expended uses are restored when you finish a long rest.