The group started to notice the changes fairly quickly compared to who they had noticed the slow changes as the environment had become more rocky the closer that they had gotten to Terra and their mountain underground city.
The steam that had begun to hang around was thick and hot. It was enough to make the air feel like it was harder to breathe in overall. Not to mention the slightly burnt smell that only came when heavy rain fell on stones.
There was also an odd floral smell that was starting to counter the burning smell. It made everyone sniff the air a little more than usual. It just put them off, however, they all remembered that this was a place where multiple different environments crossed.
While many places in the world would be like this, it was rare to have such a drastic change. The fact that the nearby mountains were growing still as the planet and nature shifted through its natural flow, was the reason for these drastic differences.
