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Once they reached the Giant Fire Ant nest, they found out there was a "mini volcano" constantly pouring lava into the surroundings. The stone slowly melted, creating large rivers of lava and even lakes.
Which poured down and slowly hardened into stones, which with the strong winds of the cliff, probably sent these stones flying down, making it an even more dangerous place to climb than before.
This entire area was the Giant Fire Ant nest "terraformed landscape", or some could even call it a Natural Domain, the monsters have poured their fire and manipulated their surroundings, completely turning them into a world fitting for their day to day lives.
This was one of the reasons these creatures, the Giant Fire Ants, were such a threat to the oasis and its jungles and nature, as to live, they had to tear apart everything and create a literal inferno.
The reason why they settled down here and not in any other place was also because of the oasis itself and its resources.
