When your hit point total reaches 0 you are disabled. When it reaches -1, you are dying unless you have a Constitution bonus, (i.e. positive Constitution modifier). If you have a Constitution bonus, you remain in the disabled state until your hit point total falls below the negative of your Constitution bonus.
- If you have a Constitution modifier of +3, you become disabled at 0 hit points, but are not dying until -4.
The point at which you die is equal to the greater of -10 or the sum of your Constitution score and hit dice.
- If you are 4th level and have a Constitution score of 16, you die at -20 hit points instead of -16.