((expectedCr >= 0 && expectedCr <= 4) ? 7 : ((expectedCr >= 5 && expectedCr <= 10) ? 14 : ((expectedCr >= 11 && expectedCr <= 16) ? 21 : ((expectedCr >= 17) ? 28 : 0))))
Undead Fortitude
Monster Feature · Example: Zombie
Effect
If the creature would be reduced to 0 hit points, there is a chance that it can instead only be reduced to 1. This feature is negated if the damage is from radiant nature.