In the Game of Thrones series conclusion, Grey Worm left Westeros - heading off to Naath. It has been dissected as a heartfelt tribute to Missandei, who had earlier been beheaded and spoke of wanting to go to that particular destination. But a user on Reddit has pointed out a somewhat awkward problem: Naath kills anyone who was not born there. So did Grey Worm effectively sail off to his death?
In a post that has been 90% Upvoted, user Rapsberry said: “Does Missandei not know about the butterfly fever?
“Wouldn't Grey Worm die within weeks after coming to Naath, since he's not a native?”
ScreenRant found the evidence for this in George RR Martin’s companion book, A World of Ice and Fire; wherein it is explained that no new arrivals “lasted more than a year, for some evil humor lurks in the very air of this fair isle, and all those who linger too long soon succumb”.
IGN, furthermore,
