race features:
As an isetsu, you have the following traits:
Anatomy
You have two arms, two legs, and four vestigial appendages.
Brittle Shell
Your carapace has a brittle, but tough, outer layer that regenerates over time. When you finish a short or long rest, you gain a +2 bonus to AC if you don’t already have this bonus. This bonus ends after you are hit by an attack roll.
Crustacean Physiology
Your antennae aid you in keeping watch, and your natural bulk and size serve you well in contests of strength. You gain proficiency in the Athletics and Perception skills.
Claws
You have claws that you can use to make unarmed strikes. If you hit with them, you deal piercing damage equal to 1d6 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike. Starting at 5th level, when you hit a creature with an unarmed strike on your turn, you can immediately use a bonus action to attempt to grapple it, in addition to dealing the damage of your unarmed strike.
Darkvision
Accustomed to the deep blackness of the ocean floor, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern colour in darkness, only shades of grey.
Fortune Favoured
Be it sheer dumb luck, the result of intense training, or the fruition of a divine blessing, you have an uncanny ability to find fortune in combat. If you miss an attack roll, or fail an ability check or saving throw, you can reroll the attack roll, check, or save. You can use this trait a number of times equal to half your proficiency bonus, and you regain all expended uses when you finish a long rest.
Natural Armour
Your shell acts as a natural source of protection. When you aren’t wearing armour, your base AC is 12 + your Constitution modifier. You can use your natural armour to determine your AC if the armour you wear would leave you with a lower AC. A shield’s benefits apply as normal while you use your natural armour.
Waterborne
You can breathe in both air and water. Additionally, being underwater doesn’t impose disadvantage on your weapon attack rolls