A once-per-game ability... I am not sure who thought this would be a good idea, but it feels terrible to use when compared to the abilities of other classes. Using this ability will make me feel as though I am permanently weakening my character, and accordingly I will never use it. The only value it provides is an illusory feeling of empowerment. It's like a nuclear weapon.
If faced with a do-or-die scenario, I will simply choose to start again from the last save. A divine intervention ability that has a percentage (or scaling percentage) chance of working, and perhaps lessened outcomes, would be vastly preferred. Please consider changing this ability to something that can be used repeatedly and thus will have utility throughout the life of a cleric.
