..
Gravestone?
Matthew was slightly stunned. This thing did not conform to the burial customs of the Aindor civilization.
When he saw the additional remarks, he was relieved.
In the information provided by Samantha, there was a port city called " Bright Sandalwood ". It was located on the east coast of the Endless Ocean and was once a very prosperous port city.
The city lord of that city was the Bright Sandalwood King. He was also the leader of the first batch of Su clansmen who had brought people across the sea to settle down in Aindor.
"There is an underwater tomb near the island, and it might have been opened by someone. Otherwise, this gravestone wouldn't have been washed here by the sea."
Matthew had a reasonable suspicion that Bright Sandalwood King's tomb was not far from the island. It might even be on the island.