The restless players not only built iron tracks in the mine, but also repurposed part of the mine into greenhouse tunnels.
These greenhouse tunnels are illuminated by magic crystal lamps, accompanied by the Dark Night Elf magic and fertilizer produced by [One Mouthful of Chemical Pool], boasting an astonishing yield.
Especially since these greenhouse caves are adjacent to the mines with iron tracks, not only can the agricultural products be easily transported outside the cave, but they can also provide abundant carbon dioxide for the crops growing inside, promoting their photosynthesis.
The only downside is that due to the low oxygen content, the Dark Night Elves responsible for spellcasting have to carry oxygen tanks engraved with Netherworld Language into the caves.
As for Luo Yan, he doesn't need an oxygen tank.
With his grasp of elemental magic, he can directly form a relatively high-pressure oxygen-rich area around his body.
