Source: Unearthed Arcana 15 - Feats
You pride yourself on your quickness and your close study of certain clandestine activities. You gain the following benefits:
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Increase your Dexterity score by 1, to a maximum of 20.
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You gain proficiency with thieves’ tools. If you are already proficient with them, you add double your proficiency bonus to checks you make with them.