Origin
The 1975 role-playing game Empire of the Petal Throne introduced the concept of critical hits (though not the phrase). Using these rules a player who rolls a 20 on a 20 sided die does double the normal damage, and a 20 followed by a 19 or 20 counts as a killing blow: "this simulates the 'lucky hit' on a vital organ."
Read more about this topic: Critical Hit
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