I don't think 1 hp a round is overpowering. It's powerful 1 thru 3 then meh. I'd even go so far as to have racial feats that let them bump it up at say 7ish to 5hp a round and then around 15 10 a round. There are magic Items that do similar things I don't think it would be overpowered.
D&D 5E Troll-blooded fast-healing characters?
Tales and Chronicles
Jewel of the North, formerly know as vincegetorix
Make it so that the player can spend 1 HDs as an action, with maybe a with a double Con mod when doing so. And maybe something like spend 5 HD to reattach a severed limb if you have more than 1 hp.
Or maybe something closer to Gift of the Everliving Ones, maximizing healing dice. Or at-will casting of False Life.
Or maybe something closer to Gift of the Everliving Ones, maximizing healing dice. Or at-will casting of False Life.
Quickleaf
Legend
I'd do:
"As a bonus action, you may spend one Hit Die to recover hit points."
It's potent – maybe on the scale of the aarakocra race getting a 50 ft fly speed? – but it's really like a toned down Second Wind that is usable more often, but comes at cost of your Hit Dice.
You could even make it an action or a reaction (to taking damage).
Quartz
Hero
I like it. You may want to make it slightly more complex: in addition you may use an Action to spend your Proficiency Bonus in HD to regain HP or reattach a limb.
Kobold Avenger
Legend
As an ability for a potential PC race:
Option 1: When who have at least 1 hitpoint, and your currents hitpoints are below half of your hitpoint total, you heal your half or your Proficiency bonus rounded up, at the start of your turn. You also gain advantage on death saving throws, and regrow lost limbs after a long rest.
Option 2: When you take a short rest, and spend hit dice to heal, you first heal up to half your hitpoint total before adding the amount healed from your hit dice. You also gain advantage on death saving throws, and regrow lost limbs after a long rest.
Option 3: As a bonus action you can spend 1 hit die to heal damage as if you were when taking a short rest. This hit die spent counts against your total you spend when taking short rests. You also gain advantage on death saving throws, and regrow lost limbs after a long rest.
And some 1d6 unarmed attack that no one really cares about, like a claw or bite as another ability.
For classes, I think that out of the fighting classes Barbarian would be the one that a Troll-themed subclass fits best in. Healing would kick in with rage and it could go beyond 3 hp, maybe something like heal 2d6 hitpoints at the start of your turn.
Less of a fit with spellcasting classes, but I feel something like a Druid, Sorcerer or a Mad Scientist Artificer might have room for a Troll-themed subclass.
Option 1: When who have at least 1 hitpoint, and your currents hitpoints are below half of your hitpoint total, you heal your half or your Proficiency bonus rounded up, at the start of your turn. You also gain advantage on death saving throws, and regrow lost limbs after a long rest.
Option 2: When you take a short rest, and spend hit dice to heal, you first heal up to half your hitpoint total before adding the amount healed from your hit dice. You also gain advantage on death saving throws, and regrow lost limbs after a long rest.
Option 3: As a bonus action you can spend 1 hit die to heal damage as if you were when taking a short rest. This hit die spent counts against your total you spend when taking short rests. You also gain advantage on death saving throws, and regrow lost limbs after a long rest.
And some 1d6 unarmed attack that no one really cares about, like a claw or bite as another ability.
For classes, I think that out of the fighting classes Barbarian would be the one that a Troll-themed subclass fits best in. Healing would kick in with rage and it could go beyond 3 hp, maybe something like heal 2d6 hitpoints at the start of your turn.
Less of a fit with spellcasting classes, but I feel something like a Druid, Sorcerer or a Mad Scientist Artificer might have room for a Troll-themed subclass.
AmerginLiath
Adventurer
Reattaching a limb feels a bit strong to do without other Magic for someone of merely troll bloodline (versus a proper troll), but I could see adding proficiency in Death saves to the ability to spend HD (since hit dice are a limited resource themselves).
Kobold Avenger
Legend
I don't think losing limbs is that common in 5e that reattaching a limb for a troll blooded character is sort of like a ribbon ability, there's the Sword of Sharpness as a rare magic item which can remove limbs. But Nycaloths no longer have Vorpal Axes or Axes of Sharpness like they used to in older edition. In fact I'd be surprised if their are any such monsters in 5e that still have such an ability left.
