Yenma's Burdenless Life

Your body is enchanted by nature, massively slowing down your bodies aging. From the point you cast this spell to the end of your life (Unless Resurrected) your body now ages 10,000 times slower than normal multiplying your remaining life span by 10,000. 

Additionally you gain adv on all constitution saving throws and are able to add (Your spell ability modifier) to any constitution saving throws until you die a natural death.