Source: Unearthed Arcana 73 - Feats

You have honed your proficiency with particular skills or tools, gaining the following benefits:

  • Increase one ability score of your choice by 1, to a maximum of 20.
  • You gain proficiency with one skill or tool of your choice.
  • Choose one of your skill or tool proficiencies. Your proficiency bonus is doubled for any ability check you make that uses the chosen proficiency.