New Suggestion:

Measuring the Outcome - Ten Minutes after Pablo uses his power at any time, Pablo has to analyze the consequences of his expense vis-a-vis his ethical code. If the consequences resulted in the most good and the least harm, he gets the full cost of his ability paid back. If the consequences are neutral, he ends up feeling tired and depressed. If the consequences go against his code of ethics, he gets hallucinations, auditory illusions, and other derangements.