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When Elayne said that she made the Rules, she wasn't wrong. The power of a Domain belonged to their master. With the power of her Domain Manipulation. Elayne had control over the very laws that governed this Realm. Of course, it also consumed a large quantity of energy to manipulate a Domain to the extent she was doing so. To alter the laws to give her incredibly regenerative abilities, to easily teleport her body, and to make it so nature always keeps itself healthy.
And to weaken the flames of the damned demon she was fighting. The Domain itself worked, suppressing his power and boosting her own. But it came with a great cost, the core of her Domain situated right below her was swiftly beginning to spend all of its accumulated energy. The Mana she had stored there for emergencies, and also the spiritual energy in there… it was being rapidly spent!