Would this be an interesting concept for undeath in a modern fantasy setting?

Death is a state of being in which consciousness becomes inert and under normal circumstances it should be permanent. But in unique cases in certain conditions an unnatural awakening happens, where either the body and mind animates or the mind and soul manifest separate from the deceased body. If the body awakens... show more Death is a state of being in which consciousness becomes inert and under normal circumstances it should be permanent. But in unique cases in certain conditions an unnatural awakening happens, where either the body and mind animates or the mind and soul manifest separate from the deceased body. If the body awakens with the mind it's previous self is essentially gone and acts on urges as a reanimated corpse. If it's the case of spectral manifestation said ghost or specter depending on strength of will may have the mind degrade over time and become a vengeful spirit that attacks without thinking on the reasoning of it's actions, but if it has a strong sense of will it will maintain it's humanity.
Update: Also Liches intentionally become undead with body, mind and soul together as one, making them powerful.
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