Grey Worm prompt to protect the Isle of Naath, Missandei’s place of origin but he most certainly would possibly not last long.

Source: HBO

Season 8 of Game of Thrones was once full of loss of life. Whether it was once Jorah Mormont who died to offer protection to Daenerys, or Varys, who died seeking to bring her down. But one notable death will have happened off-screen according to a fan theory. 

Grey Worm managed to continue to exist the siege of Winterfell and sack of King's Landing, regardless of so much of fans having the commander of the Unsullied on their demise lists. But after half-heartedly accepting Jon Snow’s banishment to the Night’s Watch after Jon killed Daenerys, Grey Worm prompt to give protection to the Isle of Naath, Missandei’s homeland

Source: HBO

But there is one drawback with Grey Worm's plan. The complete Unsullied army it will likely be dead inside of a year of arriving. Why? According to The World of Ice & Fire: The Untold History of Westeros and the Game of Thrones Naath is an island in the Summer Sea. 

Missandei and the rest of the Naathi are described as pacifists, who will refuse to combat even if threatened. That makes the island a very easy goal for slavers, and helps to explain how Missandei ended up as a slave in the first position. 

Despite their pacifism, the Naathi have resisted multiple makes an attempt at keep an eye on. The island is infested with deadly butterflies, which the locals have grown resistant to, but which will kill any outsider.

According to the Game of Thrones wiki, here is what the Unsullied have to look ahead to. 

“A large species of butterfly on Naath is a provider for a horrific disease that makes the flesh actually slough off of a person’s bones, however the Naathi themselves are proof against it. For centuries, would-be overseas invaders would end up succumbing to the ‘butterfly fever,’ and the Naathi say none maintained a presence on the island for more than a single 12 months.” 

While the illness was never mentioned on the display, Nathalie Emmanuel’s title seems subsequent to a butterfly in the show's opening credit. 

Source: Game of Thrones

In short, the Unsullied are useless. 

Missandei and Grey Worm did talk about returning after the struggle, with Missandei saying that she wanted to return house and Grey Worm announcing that he would sign up for her to give protection to the island. 

They smile tenderly at each and every different, but Missandei does not warn Grey Worm about the butterflies... 

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