Boarish Resilience (5e Feat)

Prerequisites: Shifter (Beasthide)
Your lycanthrope ancestry has lead to you having powerful fortitude, even at death's door.

Increase your Constitution by 1, up to a maximum of 20.
When you are reduced to 0 hit points but not killed outright, you can drop to 1 hit point instead. The damage can't be more than half your hit point maximum. You can’t use this feature again until you finish a long rest.