Immortality is a type of magic featured on ABC's Once Upon a Time. The term refers to those who practice powerful magic, to the point where they are rendered immortal, meaning that they can live forever and are virtually indestructible.
- Dark Ones
- Jiminy Cricket
- All forms of immortality come with exceptions. For instance, while Merlin could live forever, they doesn't mean that he couldn't be killed, which he is. With the Dark One's Curse, anyone under the curse can still be killed if someone stabs them with the dagger.
- While deities cannot be killed, they can be destroyed with the Olympian crystal.
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