The campaign I'm (slowly) writing includes a healing house rule.
When you heal, you must also consume a HD. That HD is added to the amount you heal.
This includes most magical healing, except Regeneration effects. It also includes using the Healer's Kit. Fighter's Second Wind is increased to 1/2 Fighter Level d10 (round down) + fighter level but doesn't cost HD (it is, in effect, bonus HD).
Now, it also uses gritty rests (short rests are overnight), but that is a pacing mechanism. ("Dungeons" or encounter sites are budgeted to last a single scene, time between short rests).
There is also a system whereby HD recover faster than baseline 5e (overnight (aka, short rest), you get to roll expended HD to recover: even rolls 4 or greater recover. This recovers about half of your HD on a d12, but 1/3 of your HD on a d6).
All healing is bigger; a level healing word on a barbarian heals 1d12+1d4+3 (12), and a healing potion is 13.5, both of which is are pretty nice. But larger heals are more efficient in terms of HD used. If you use piles of small heals, you'll end up exhausting the person you are healing too fast.
When you heal, you must also consume a HD. That HD is added to the amount you heal.
This includes most magical healing, except Regeneration effects. It also includes using the Healer's Kit. Fighter's Second Wind is increased to 1/2 Fighter Level d10 (round down) + fighter level but doesn't cost HD (it is, in effect, bonus HD).
Now, it also uses gritty rests (short rests are overnight), but that is a pacing mechanism. ("Dungeons" or encounter sites are budgeted to last a single scene, time between short rests).
There is also a system whereby HD recover faster than baseline 5e (overnight (aka, short rest), you get to roll expended HD to recover: even rolls 4 or greater recover. This recovers about half of your HD on a d12, but 1/3 of your HD on a d6).
All healing is bigger; a level healing word on a barbarian heals 1d12+1d4+3 (12), and a healing potion is 13.5, both of which is are pretty nice. But larger heals are more efficient in terms of HD used. If you use piles of small heals, you'll end up exhausting the person you are healing too fast.