According to Master Jade Pill, the fourth chamber of the ancient tomb was previously opened by the Fiery Sun Sect. However, it unleashed at least Nascent Soul level killing intent. Although it's been thousands of years, its power remains immense, instantly killing a Fake Pill True Man from the Fiery Sun Sect in just one encounter.
Moreover, compared to the three tail chambers Li Ji'an and the others previously experienced, the scale of the fourth chamber is much larger, reportedly extending several thousand meters to the west, divided into thirty-six smaller zones within.
The Alchemy Room was found in one of these small zones.
Inside, alchemists from six sects discovered many ancient pill formulas immensely beneficial for Core Formation Stage cultivation, worth a fortune.
Thus, the six sects are particularly attentive to this ancient tomb.
