In some games of ol' that I used to play, I recall players had options to "burn" resources for a greater in-game impact or influence. ShadowRun is an example. You would use karma for minor things, but had to burn karma for major ones, and could burn your entire karma pool for a "Hand of God" IIRC.
So, what about in D&D? (2024 included... but we don't have a tag for "both" 2014 and 2024...).
The discussions about players getting to decide if their character actually died or not, as well as the threat on harsh house rules, got me thinking about this.
The primary use IMO would be for auto-success on a d20 roll. This would include any ability check, attack, or save (including death saves). Now, I don't just mean an auto-20 for that roll, I mean auto-success for that roll, since sometimes a 20 might not do it.
For things like critical hits and death saves, perhaps even 2 HD?
EDIT: (added) It could also be used to simulate "level drain" from AD&D... make it HD drain instead.
Once "burned", the HD are lost forever. This includes how many you have to spend on a short rest to recover HP.
This makes it a very hefty cost, but perhaps such a sacrifice is better than the alternative?
Frankly, I really like this idea and will propose it to my group Friday night. But, I would enjoy hearing other peoples' thought. Not a (+) thread, so if you don't like it feel free to rant why not.