Mighty Lungs

You have mastered the use of the living bellows that are your lungs, swelling your chest with fortitude and granting you the following benefits:

• Increase your Constitution score by 1, to a maximum of 20.
• You can hold your breath twice as long as usual.
• You are able to shout loud enough to be heard clearly from 500 feet away.
• As an action, or in place of one of your attacks if you have the Extra Attack feature, you can attempt to deafen an enemy within 5 feet of you by screaming into their ear. Your target must make a CON save with a DC equal to 8 + your proficiency modifier + your Constitution modifier, becoming deafened until the end of your next turn on a failure.
• You may add your Constitution modifier to the damage you deal with a blowgun and blowguns have a range of 60/300 for you.
• You have advantage on any roll to resist gaining exhaustion from continuous physical activity, such as a sustained run or a forced march.
• At your DM's discretion, you may add your CON modifier to Intimidation rolls that you make as long as you are being loud.