Assuming the Druid's level is high enough to stay in Wild Shape, can the Druid's beast form regain lost Hit Points resting this way? If so, does he use the beast's hit dice or the Druid's?
[RPG] Can a Wild Shaped Druid regain hit points after a short rest
dnd-5edruidhit-pointsrestswild-shape
Related Solutions
There are no rules that state that a wild shaped druid is not able to take or benefit from a short rest. There is a clearly defined list of what they cannot do in the PHB.
As there is no requirement to maintain concentration or focus on the shape, and because transforming does not break concentration on existing spells, a druid is able to meet the requirements for a short rest.
PHB Page 67
You retain the benefit of any features from your class, race or other source, and can use them if the new form is physically capable of doing so.
PHB Page 186
A short rest is a period of downtime, at least 1 hour long, where the character does nothing more strenuous than eating, drinking, reading or tending to wounds.
Unless your form is described as a never stopping ball of energy, most forms are capable of resting, and therefore are capable of regaining uses of wild shape.
The closest thing I can see applying is that, as a player character, you can choose to take average hit points or roll for them every time you take a level.
Each time you gain a level, you gain 1 additional Hit Die. Roll that Hit Die, add your Constitution modifier to the roll, and add the total to your hit point maximum. Alternatively, you can use the fixed value shown in your class entry, which is the average result of the die roll (rounded up).
I'd make the case that it's always the PC's choice, since it's still the hit points of the PC we're talking about, and with RAW they can choose their HP generation method at any time they roll.
There's no rule that I've found that provides an exception that would allow the DM to dictate PC hit points, or any other character feature choices for that matter. So, unless someone else finds one, I interpret that as being the player's choice.
5E's 'exception based' design principle provides support for that. Crawford has said on record that if a spell or an ability doesn't explicitly define a feature or limitation, then don't infer it to be there. The example was: Fire Bolt says it sets unattended things on fire, so it does. Produce Flame doesn't say that, so you don't have to spend time figuring out if it does or it doesn't; it just doesn't. I would interpret that to mean: since there isn't something specific in the Wild Shape rules, don't infer anything beyond what players already do for their hit points.
Whether they always take average, or always roll, or roll once and keep that number for a given animal for the life of the character... that also seems like a good place for a character-driven decision that becomes part of their flavor, and I'd need something compelling to take that choice away.
Best Answer
The druid can use the beast's hit dice to heal the beast form. His own are not expended.
If you are able to maintain a beast form longer than the time of a short rest, then you would use the beast's hit die, since you're given them in the Wild Shape description.
Okay that sounds all well and good, right? But it gets more questionable after that. Since the book doesn't specify what happens to your original hit die, it is safe to assume your druid's hit die are untouched for a number of reasons.
My second bullet point may be wrong, my assumption I'm making for this answer is: you can only expend a current form's hit die to heal that form.
For the second bullet point to be correct, then the next option about how this works relies on your forms being considered separate entities. This would mean that when you short rest, your beast hit die you expend only heal your beast form and your regular character sheet's hit die only heal your druid form.
In summary,
Hit die spent as a beast will not affect the hit die of your original form. But can only heal your beast form.