[@Ace of flames01]How are these abilities powered?

Is it internal, like a battery? How do they "charge" it? Or is it external, converting something outside of them, such has heat, that they draw out of large area? Large battles may require the construction of ovens for the combatants to draw on, while small battles between a few can cause frost and hypothermia in people who are too close.

Secondly, is one of the abilities to stop others from using theirs? A gifted dampener? No matter what's thrown at them, they can just negate it?