Boy-King by ellaine, showing Sam as Lucifer's vessel, this piece was posted the day after the episode aired (2009)
Endverse is a canonalternative universe shown in episode 5x04, The End, of Supernatural, taking place five years into the future of the series' canon. This universe has several elements, the most prominent being that Sam Winchester accepted Lucifer and became his vessel, Castiel is no longer an angel, Dean is the leader of a resistance group fighting against Lucifer's forces, and the world has been ravaged by the Croatoan virus.
The Endverse has proved enduringly popular with fans, even more than a decade after the episode aired, due to the many possibilities presented by the episode's post-apocalyptic setting (particularly for angsty and dark fanworks) and the alternate versions of the characters found there.
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