You’ve developed the ability to manipulate your body to not only fit your persona, but also you surroundings, you gain the following benefits

• Increase your dexterity score by 1 to a maximum of 20
• You gain proficiency on stealth checks, if you already have proficiency, it becomes expertise
• You gain advantage on stealth checks if you aren’t moving or making sound
• You may choose to change shape as a bonus action and may also attempt to hide anywhere as a part of the same bonus action
• When attempting to deceive or hide on the basis of sight, you may use stealth or deception