Nostalgia
Bonet's sockets flickered with an intense light as he welcomed another day in undeath. He rose from the position which he had laid in and stood up.
His spot was a hollow space in the wall where he and the rest of his dead folk would go into 'slumber' – each with their own individual spots, of course.
Below his own hollow was another one also etched into the same wall, one of his many brethren still in slumber within it though only moments away from being revived into fresh death by the power of their master.
The tomb was small, with a large, firm rock covering the circular entrance imposingly, this clearly being a hilarious aesthetic placed by the unfunny higher echelon of the dead, as in all seriousness, who could escape from this place?
Bonet's fellow brother in death shook, causing his bony body to rattle and the fire in his sockets to burn a bright blue.