The Legendary Janitor
Most people don't choose reincarnation. Reincarnation finds their way to them. Perhaps they did something great in their life. Or maybe truck-sama wasn't looking where it was going. But without fail, those who reincarnate are destined for something great. A new life where everything changes for the better. But... Reincarnation isn't always the greatest thing. Sometimes you just draw the short end of the stick. Di Tou just happens to have drawn the shortest stick. Pulled out of his life randomly. Taken by a crazy old eccentric man not as a disciple, but as a body double?! And a janitor body double no less?! Grasping a system to find... It's a JANITOR SYSTEM!? Truly, how unlucky can one get?
Spatial Relics!
Excited at the various methods the clerk had mentioned, Di Tou couldn't help but feel that an expert's advice was helpful. After all, in the end he was trying to approach things based off his understanding of the modern world. When it came to the actual methods commonly used for cultivation, Di Tou had to admit he was a bit clueless.
"Ah, wait… The formation, does it need to use Qi?"
"Oh, err, it ideally does use Qi, but it can also be run using Spirit Stones, or if the density of the Qi in the environment is high enough, it can also be run directly by using the environmental energy. In your case, you could probably activate it using your Spiritual Sense, and then it would run for about an hour, consuming one Low-tier Spiritual Stone in the process."
Nodding, Di Tou couldn't help but feel relieved, ah, it seemed like batteries were the solution to everything in the end.