Tough V4

Increase your CON by 1 to a maximum of 20.

Due to your tough nature, you also gain advantage on CON saves

Your hit point maximum increases by an amount equal to twice your level when you gain this feat. Whenever you gain a level thereafter, your hit point maximum increases by an additional 2 points.

When you score a critical hit that deals slashing damage to a creature, you grievously wound it. Until the start of your next turn, the target has disadvantage on all attack rolls.