Feo Jera's Garrison

Feo Jera’s Garrison is a military base that stood between the Great Rift and Feo Jera.

Background
Situated between the capital of the Dwarf Kingdom and the natural barrier, the Great Rift. Further to the edge of the Great Rift was a fortress that stood watch over a rope bridge that hangs over the chasm.

The Craftsman of Dwarf Arc
The garrison was suddenly attacked by a massive force of Quagoa that managed to bypass the fortress guarding the rope-bridge across the Great Rift. Fearing the worst, the Commander-in-Chief ordered the gates to be sealed. The soldiers managed to hold the demi-humans long enough to close the gates thanks to their Magic Casters.

Despite plans to bury the gate with earth, it was only a matter of time before the army dug through. When word from the fortress on the surface reported an army of monsters, the Commander and his Chief of Staff went to investigate. Learning that it was a delegation from the Sorcerer Kingdom the Commander accepted aid from Ainz Ooal Gown to dispatch the demi-human army. The Sorcerer King lived up to his word, summoning two Death Knights that annihilated the demi-humans driving them back across the Great Rift.

Layout
From the garrison, a gently-sloping tunnel in the shape of a spiral led from it and ahead was the capital Feo Jera. The cavern where the garrison was located at was the dwarves' final defensive line, and on top of that, the gates of mithril were alloyed with orichalcum. The gates could withstand an enemy attack from the tunnel they were closed.

Trivia

 * It was suggested by the commander of the Dwarven Army that the gates should be electrified but the Regency Council dismisses the idea of believing the base’s defenses were adequate.