Hellmouth (Zeltwachen Infection)

"Werner Werman hated Nolte Geschwefel. He know that if Werman can slay that gigantically demonic version of Geschwefel like a true knight in shining armor, then we can destroy Hellmouth and save Zeltstrich. I'll never let him down. I'll make him proud. I'll save the Werman Reich and make the ducangers of South Vietnam feel ashamed."

--Su Ji-Hoon, The Army of Zeltstrich's Darkness

In during Zeltwachen Infection, the Hellmouth is the pit hell object that it would be making Nolte Geschwefel turned into massive giant demonic version of himself, same as Hellmouth from Zombie Army Trilogy.

Want to defeat Nolte Geschwefel, the Survivor Brigade and heroes must have Sagarmatha Relic and finding another tainted skeletons (or tainted corpses) from various tomb rooms in all locations of his castles for defeat him.

It would be located in his larger throne room from his castle that it is where he turned into massive giant demonic version of himself

Nolte Geschwefel using his powers to summon more zombies and attack heroes by flame attack and demon magic when he is in new form. He would be eventually defeated, and reverts back to his zombie form, before being thrown into his Hellmouth, into the firey pits of hell.

Therefore,Sagarmatha Relic would destroyed in order to close this Hellmouth and end the zombie apocalypse in Zeltstrich.

It would be appeared in chapter  The Army of Zeltstrich's Darkness