race features:
Iron Fists: When you make an unarmed strike, you can deal 1d4 + your Strength modifier bludgeoning damage instead of the normal damage.
Relentless Endurance: When you are reduced to 0 hit points but not killed outright, you can drop to 1 hit point instead. You can’t use this feature again until you finish a long rest.
Toughness: Your hit points maximum increases by 1, and it increases by 1 every time you gain a level.