Thick Skinned

Your skin is incredibly resilient, you may not avoid many attacks but you can surely take a hit. Taking this feat grants the following benefits:

• Your constitution score increases by 1 and can exceed 20 total
• When not wearing armor your Armor Class is calculated as 10 + Con Modifier + 1/2 Con modifier (rounded up), you can use a shield and still gain this benefit. (DND Beyond does not support this so it must be edited manually)
• You gain Advantage on Athletics checks

However, due to the thickness of your skin you move slower, as a result you gain disadvantage on Dexterity Saving Throws, and your movement decreases by 5 feet. (DND Beyond also does not support these so they must be edited manually)

This feat also overrides the Unarmored Defense ability for Monks and Barbarians.