Rules: ld say that a severed hand is more an object than a creature, so no.
Reason: Allowing this could create problems: what happens if I cut off my hand, have someone cast regenerate on it, then on me ? You would get a clone.
And if you're capable of casting regenerate yourself, you could basically build an army of you in less than a month (since your clone would be able to as well).
If that's something you would be interested in doing as a DM, I would find a way to explain why doesn't everyone do it. There would probably need a cost of some kind (sacrifices are always good, or a cost on the soul, such as loss of abilities/level)
"You touch a creature and stimulate its natural healing ability. The target regains 4d8 + 15 hit points. For the duration of the spell, the target regains 1 hit point at the start of each of its turns (10 hit points each minute). The target's severed body members (fingers, legs, tails, and so on), if any, are restored after 2 minutes. If you have the severed part and hold it to the stump, the spell instantaneously causes the limb to knit to the stump."
The spell specifies a creature as a target. Not a dead creature or a part of a dead creature. A hand by itself is not generally a creature so the spell wouldn't work. Resurrection type (raise dead, revivify, resurrection) spells specify a dead creature as the target or one that has recently died.
The MM defines a monster as: "A monster is defined as any creature that can be interacted with and potentially fought and killed." So monsters are a subset of creatures that includes PCs and NPCs. Anything that could possibly be killed or interacted with is essentially a creature. Body parts aren't creatures and something that is dead (not undead :) ) is also not a creature so regenerate doesn't work on these targets.
I think the " stimulate its natural healing ability" wording seems pretty specific as well. The target needs to be alive and functioning for it to work, since it would need to have some degree of self-healing possible in the first place.
Can the spell regenerate regrow a missing body if it was cast on a single body part like a hand?
Rules: ld say that a severed hand is more an object than a creature, so no.
Reason: Allowing this could create problems: what happens if I cut off my hand, have someone cast regenerate on it, then on me ? You would get a clone.
And if you're capable of casting regenerate yourself, you could basically build an army of you in less than a month (since your clone would be able to as well).
If that's something you would be interested in doing as a DM, I would find a way to explain why doesn't everyone do it. There would probably need a cost of some kind (sacrifices are always good, or a cost on the soul, such as loss of abilities/level)
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Yeah, no. Unless the hand is a living creature with a soul (if applicable).
Regenerate:
"You touch a creature and stimulate its natural healing ability. The target regains 4d8 + 15 hit points. For the duration of the spell, the target regains 1 hit point at the start of each of its turns (10 hit points each minute). The target's severed body members (fingers, legs, tails, and so on), if any, are restored after 2 minutes. If you have the severed part and hold it to the stump, the spell instantaneously causes the limb to knit to the stump."
The spell specifies a creature as a target. Not a dead creature or a part of a dead creature. A hand by itself is not generally a creature so the spell wouldn't work. Resurrection type (raise dead, revivify, resurrection) spells specify a dead creature as the target or one that has recently died.
The MM defines a monster as: "A monster is defined as any creature that can be interacted with and potentially fought and killed." So monsters are a subset of creatures that includes PCs and NPCs. Anything that could possibly be killed or interacted with is essentially a creature. Body parts aren't creatures and something that is dead (not undead :) ) is also not a creature so regenerate doesn't work on these targets.
I think the " stimulate its natural healing ability" wording seems pretty specific as well. The target needs to be alive and functioning for it to work, since it would need to have some degree of self-healing possible in the first place.
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