From Action Comics #1036, the first issue of the Superman event THE WARWORLD SAGA.
We're making it a point to include endless pieces of lore and culture throughout Warworld during this run. If you look closely, on this page you'll see two alien corpses preserved in the (1/ )
semi-translucent stone below Superman and the Authority. These were brother-and-sister rulers of their world, who led the last defense against the invasion of the current Mongul's grandfather. When that Mongul ultimately prevailed, he had these two buried alive and (2/ )
preserved in this monument to Mongul's victory over their race.
All the survivors of that invasion were enslaved on Warworld, and subsequently died in the years since due to their incompatibility with Warworld's atmosphere and living conditions. Although Superman wouldn't (3/ )
have any way of knowing, the bodies trapped in this stone are the last specimens of their species in existence, anywhere in the universe. (4/4)