Helm leaned against the crumbling archway, his breath ragged strips of heat in the cold cavern air. Behind him, the tunnel collapsed in a slow, final roar — sealing the manticore brood and two-thirds of the Crimson Horde on the other side. His plan had worked. The rear guard had done its duty.
The Sanctum did not welcome them.
It seems you're looking for a deep story continuation based on the raw Japanese chapter 51.2 of Kochugunshikan: Boukensha ni Naru (The Rearguard Officer Becomes an Adventurer), specifically leading into chapter 52.2. Helm leaned against the crumbling archway, his breath
"I had the terrain. And you left me caltrops."
"The artifact is in the center," Helm said, consulting the map they'd taken from the brood mother's corpse. "But the guardian —" The rear guard had done its duty
"What are you doing?" Helm asked.
"Will face us ." Gunther hefted his axe. "Not just you, tactician. Us. The whole party. The one you keep trying to protect by pushing yourself into the dark." "I had the terrain
The construct lunged.
The guardian rose from the mirror floor — a construct of liquid silver and stolen memories. It wore the face of Helm's former captain, the one he had left behind to die in the Battle of Ashford Ford.
"Chapter 52," he finally said. "That's what they'll call this part of the tale. 'The Rearguard's Final Stand.'"
And for the first time in twenty years, Helm did not step forward to meet the blow alone.