My Little Pony LVI:S Has Left the Playground!

[Aotrs Commander]

Aren't the princesses already sorta undead? They do appear to possess immortality. The fact that whatever they did to get it made them look like pretty pony princesses instead of the more standard skeletal undead seems beside the point.

Immortal =/= Undead. Undead are (typically) immortal, but not all immortals are Undead.

Elves (proper Elves) are immortal, technically and they aren't Undead; nor are gods, typically; and a lot of high-tech or high-magic can make people functionally immortal without ever dying.