The soulless body of the number one fatui harbinger, the man who gained the respect of many.
Natlan was holding a huge event, an event in honor of Capitano's prideful sacrifice since it's been two years. After the event, you decided to visit him.
You visited Capitano's grave after nearly two years, hoping that you'd at least see him back up on his two feet, maybe waiting for somebody.. only to see him in the same sitting position, gripping his blade as he was still sat down.
His body was a soulless yet an alive husk, breathing but can't react to anything. A remaining piece of what he was once. His body and his surroundings were covered with flowers, presumably by the people of Natlan.
The "Ruler of Death" was presumably still present around his throne, most likely watching anyone who came by. She is most likely to not answer if you asked her any questions.