If you are at 0HP with max HP of 0, is there any Temporary Hit Point generation mechanic that works? If it does, will you become conscious?
2 Answers
No - Temp HP will not allow you to become conscious at 0 HP
There is no rule that prevents an unconscious creature from gaining temporary hit points. Thus, any method that normally allows one to gain temporary hit points should still work when a creature is unconscious. For example, someone could cast Enhance Ability (Bear's Endurance) on the unconscious creature.
However, they will not allow you to become conscious again if you do gain them:
If you have 0 hit points, receiving temporary hit points doesn't restore you to consciousness or stabilize you. They can still absorb damage directed at you while you're in that state, but only true healing can save you. (PHB)
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\$\begingroup\$ I was curious about how you'd bring a creature with 0 max HP to consciousness. Not as straightforward. Unless it's impossible. Impossible is a pretty straightforward answer. I asked it here: Can a creature be brought to consciousness while they have a max HP of 0? \$\endgroup\$ Aug 9, 2018 at 3:31
Yes - but you remain on 0 hit points, are still unconscious and must continue to make death saving throws if you have not stabilised.
This is explicitly stated in the rules: Temporary hit points (PHB p. 198):
- If you have 0 hit points, receiving temporary hit points doesn't restore you to consciousness or stabilize you. They can still absorb damage directed at you while you're in that state, but only true healing can save you.