In D&D sometimes bad rolls happen, the 1st level wizard gets double criticaled and loses 20 hit points in one attack, The fighter throws his awesome sword in the ravine because he rolled a 1 on his attack, that sort of thing. In my games I run a house rule called fates. Fates are do overs. Every player get a set amount of them at the start of the game say 5 or 6 and can use them to take back one action, re roll one die, or force a monster to re roll an attack. They are my oops button.
How players use these tends to influence their life span quite a bit. A player that hordes them till they are used for life an death reasons tends to live longer than the player that blows them quickly on random attack rolls and such. I occasionally will give out more fates but not often, they are meant to be a rare resource to be used wisely