Bacon Bits
Legend
Having read through Raise Dead, Resurrection, and True Resurrection, I can now say very clearly that the designers didn't answer this question. It's exactly ambiguous enough to not actually answer it.
5e says:
Raise Dead: "The spell can't return an undead creature to life."
Resurrection: "You touch a dead creature that has been dead for no more than a century, that didn't die of old age, and that isn't undead."
True Resurrection: "If the creature was undead, it is restored to its non-undead form."
The trouble is the fact that the stupid spells insist on calling the target a "creature" so it's completely ambiguous if they mean that you're casting it on an unliving undead creature or a destroyed undead creature.
3.5e made an explicit distinction between casting the spell on undead and destroyed undead:
Raise Dead: "A creature who has been turned into an undead creature or killed by a death effect can’t be raised by this spell. Constructs, elementals, outsiders, and undead creatures can’t be raised. The spell cannot bring back a creature that has died of old age."
Resurrection: "You can resurrect someone killed by a death effect or someone who has been turned into an undead creature and then destroyed. You cannot resurrect someone who has died of old age. Constructs, elementals, outsiders, and undead creatures can’t be resurrected."
True Resurrection: "You can revive someone killed by a death effect or someone who has been turned into an undead creature and then destroyed. This spell can also resurrect elementals or outsiders, but it can’t resurrect constructs or undead creatures."
So 3e in Resurrection and True Resurrection makes a very clear distinction between casting the spell on an undead creature that has been destroyed and and undead creature that has not been destroyed (the latter of which doesn't work). 5e, feels like it keeps half of that language, but not all of it. It doesn't feel clear to me what the intent here really is.
God help me, I think we'd need an official answer.
5e says:
Raise Dead: "The spell can't return an undead creature to life."
Resurrection: "You touch a dead creature that has been dead for no more than a century, that didn't die of old age, and that isn't undead."
True Resurrection: "If the creature was undead, it is restored to its non-undead form."
The trouble is the fact that the stupid spells insist on calling the target a "creature" so it's completely ambiguous if they mean that you're casting it on an unliving undead creature or a destroyed undead creature.
3.5e made an explicit distinction between casting the spell on undead and destroyed undead:
Raise Dead: "A creature who has been turned into an undead creature or killed by a death effect can’t be raised by this spell. Constructs, elementals, outsiders, and undead creatures can’t be raised. The spell cannot bring back a creature that has died of old age."
Resurrection: "You can resurrect someone killed by a death effect or someone who has been turned into an undead creature and then destroyed. You cannot resurrect someone who has died of old age. Constructs, elementals, outsiders, and undead creatures can’t be resurrected."
True Resurrection: "You can revive someone killed by a death effect or someone who has been turned into an undead creature and then destroyed. This spell can also resurrect elementals or outsiders, but it can’t resurrect constructs or undead creatures."
So 3e in Resurrection and True Resurrection makes a very clear distinction between casting the spell on an undead creature that has been destroyed and and undead creature that has not been destroyed (the latter of which doesn't work). 5e, feels like it keeps half of that language, but not all of it. It doesn't feel clear to me what the intent here really is.
God help me, I think we'd need an official answer.