Or you could do something like a time rewind, but as a different ability, not as a perk. An automatic rewind of 1 turn in case of death in battle, with the possibility of rewinding several hours (one hour/several minutes) at will. Once a day/every few days, with no penalty to willpower. If it's balanced, that's also fine, although I don't know if everyone will find it useful./
Or you could do something like a time rewind, but as a different ability, not as a perk. An automatic rewind of 1 turn in case of death in battle, with the possibility of rewinding several hours (one hour/several minutes) at will. Once a day/every few days, with no penalty to willpower. If it's balanced, that's also fine, although I don't know if everyone will find it useful./