An Illusion

If the seer sent the rest of Mistletoe to find the so-called treasure, he knew something about these ruins and sought it. But, on the other hand, Arthur was clueless about this place despite receiving an invitation from it.

That person must also be the one who allowed Mistletoe to teleport into the ruins after Arthur left. There could only be one person he could think of, and it was the same person trying to obstruct him.

The first time he had a private interaction with the Ghost Ruler, that person sent Arthur to meet Mistletoe and the puppeteer. This early meeting was the last thing that Arthur wanted because he was still not ready to meet many people in his life.

This was why he never met his family, Mistletoe, Ellen, Lilo, and everyone he missed after going to Alka. These friends or family will notice that Arthur is not the same person they know and love. It would lead to a similar situation to his current one.