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@sadaqah Indeed. the 5e version trivialises the effect. It's just happened to my character and frankly I don't really mind. In 1e the effect was something everyone feared. Now I just need to have a rest; big deal.
In a sense, the repeating 20s were a critical (but not automatic) hit - it meant that a 20 allowed you to hit 5 armour classes better than you would expect to.