The crops
Sasha winterchild roamed on the newly condensed ice cap atop the ravines.
The ice was made with her ability, thus, compared to frozen lakes and rivers, it's more clear.
She could see the picture underneath the ice floor, full of black and red dots.
All the sewage of the Strongfort is guided to the deepest point of the ravine.
God knows what the warm temperature did to it, but one fine day, an explosion happened in the ravine.
After that, like magic, few of the walls were lit with eternal fire.
Sasha wondered what in the world happened there.
Eventually, it's mage Aberdeen who made a reasonable explanation, though Sasha thought it was bonkers.
The sewage chambers under strongfort were natural caves, which are kind of connected to each other but not to the hot springs. This way, these sewage caves ran all the way down to the lava river flowing under the ravine.