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They do not simply kill you. They remove your soul and consume it utterly. They end you.
Alasdair Coames[src]

Enders are soul-eating demons that obliterate souls when they consume them. Quite literally, they do not only kill their victims, they erase them from existence. Spike and Faith killed a coven of them in London to retrieve the Essuary.

An Ender preparing to feed.