Natural Hider (5e Feat)

You have trained to get quickly out of sight, becoming especially deadly when you do. You gain the following benefits:

You can take the Hide action as a bonus action.
You gain proficiency in stealth. If you already have proficiency in stealth, you add double your proficiency bonus when you make Dexterity (Stealth) checks.
When you make a weapon attack against a creature that can't see you with a weapon with which you are proficient, you add double your proficiency bonus to attack rolls instead of your normal proficiency bonus.