The humidity in this Secret Realm would have been bearable, but the key issue was the lack of air, which made it impossible to light a fire. Without the ability to make fire, no medicine could be prepared.
But because it was part of the Sea Emperor Temple, collecting and accumulating the Power of Faith had to be done here temporarily. San Niang couldn't leave, so Zhao Changhe had to go to Tang En's ship to prepare the medicine and also to get some other medicinal ingredients from the ship to mix.
This showed that a team needed to have multiple Attributes combined—having tanks, DPS, and healers was necessary, and a Mage would be a welcome addition. If there were a Winged Fire Snake or even the Vermilion Bird here, who would care about humidity or air? They'd light the fire without discussion.
