What about the AI? How will AI use this?
If the power gradually reduces as the energy is used up, then the AI simply needs to re-evaluate the chance of success based on remaining psi energy.
Nothing simply happens Someone has to write code for it...
This is permanent resources that need time to regen? This could be used (after name change) to simulate long term exhaustion.
There are other threads for combat stress/fatigue, for example here: https://openxcom.org/forum/index.php/topic,4473.0.htmlPlease keep this about mana.