Nine Lives Luck

Your feline blood has gifted you with the extraordinary ability to spring right back up when downed. 

You gain 1d8+1 Cat Points. These points cannot be restored by any means other than a Wish spell. You also regain 1 Cat Point when resurrected from death, such as by a Revivify spell. 
When you make a death saving throw, you can use a Cat Point to treat the number rolled on the D20 as a 20. If you make a death saving throw on your next turn, you gain advantage on the roll.  You can use this benefit only once per short rest.