10 minutes later, at the entrance of Staircase 16.
Dozens of Imperial Soldiers fled chaotically from the staircase interior.
They were the members of the reconnaissance squad and the combat squad led by Sergeant Alvin Stafford.
The entities chasing them were not Frost Skeleton Mages, but Tomb Walking Dead covered in rotting flesh, and skeletal soldiers with empty eye sockets.
An endless Undead Army swarmed out from the staircase interior, treading on the heels of the Empire's soldiers, and crossed into the first underground level of the tomb hall.
The phenomenon happening at the entrance of Staircase 16 was not an isolated case.
All staircase entrances, except the first and second blocked by the river, were flooded with a huge number of undead forces.
"Dadada..."
The ripping sound of gunfire rang out.
The water-cooled light machine guns waiting at the staircase entrance spouted tongues of flame, facing the approaching undead with a flood of bullets.