>>50410880This one isn't as much headcanon as much as it something I made up for my own universe.
>When a Xatu nears the end of its life, it receives a vision of the end of the world, know as the Apocalypse Prophesy. Every single Xatu that has ever seen it dies within 24 hours of receiving it, ranging from random disasters, to sudden heart attacks, to simply accepting it and passing in their sleep. 