Regenerator

Prerequisite: Lizardfolk 

You can stimulate your natural healing ability. You regain 10 hit points. For one hour, you regain 1 hit point at the start of each of your turns (10 hit points each minute).

any severed body members (fingers, legs, tails, and so on), if any, are restored after 2 minutes. If you have the severed part and hold it to the stump, the spell instantaneously causes the limb to knit to the stump, otherwise severed limbs or other body members are regrown 1d4 days later.

You can only use this ability once per long rest and only if you are below your maximum hp.