Iry
Hero
The number of death saving throws is reset to zero when you regain any hit points or become stable. This means a Vampire can repeatedly damage you and reduce your maximum hit points down to 0 as long as he can stabilize you before death. Vampires with Medicine or Spare the Dying will have the easiest time of it.
BUT!! (Dramatic Drumroll)
When damage reduces you to 0 hit points and there is damage remaining, you die if the remaining damage equals or exceeds your hit point maximum. A vampire deals 7 Piercing and 10 Necrotic damage (unless you roll for damage). In order to rise as a vampire in this way you must have 10 or fewer maximum hit points.
If you have 1-8 maximum hit points remaining, then 17 damage will invoke Instant Death. This means you need exactly 9 or 10 hit points to avoid Instant Death and die through having your maximum hit points reduced to 0.
But that is silly and should just be handwaved.
BUT!! (Dramatic Drumroll)
When damage reduces you to 0 hit points and there is damage remaining, you die if the remaining damage equals or exceeds your hit point maximum. A vampire deals 7 Piercing and 10 Necrotic damage (unless you roll for damage). In order to rise as a vampire in this way you must have 10 or fewer maximum hit points.
If you have 1-8 maximum hit points remaining, then 17 damage will invoke Instant Death. This means you need exactly 9 or 10 hit points to avoid Instant Death and die through having your maximum hit points reduced to 0.
But that is silly and should just be handwaved.