The Nine Suns Purgatory was considered a more dangerous area within the Nine Suns Domain. It was a place to take risks and go through training, also one of the hottest places in the Nine Suns Domain. Otherwise, it wouldn't be referred to as a purgatory.
The Nine Suns Purgatory was scorching hot, and ordinary people who entered this place would be lit up in flames. There were only Firewood and demonic beasts with fire attributes here. Moreover, there was no water in the Nine Suns Purgatory, only boiling magma. Any water would evaporate completely here.
Some of the fire attributes demonic beasts would eat a type of plant to obtain water. This plant was very mysterious and in a tube shape with water within it. There was quite a number of such plants, and they were the primary water source in the Nine Suns Purgatory. Of course, the people who came to train here would tend to bring along their own water. However, if there were any accidents or if they had finished the water they brought, they would also need to depend on these plants to replenish their water.
In the Nine Suns Purgatory, even the rate of water loss that cultivators experienced was also especially fast.