The Fighter archetype "Champion" lists the skills "Improved Critical" and "Superior Critical", which state that my weapon attacks score a critical hit on natural 19-20 and natural 18-20, respectively. The description for either of these abilities don't explicitly state whether these attacks have the autohit properties of a natural 20 or not, though they could be interpreted to mean that. Given a single level 3 Champion fighter with no active magical effects fighting an enemy with infinite AC, would that fighter have a 5% chance to hit (nat 20 only), or a 10% chance to hit (nat 19+20)?
[RPG] With Improved Critical, can a critical hit still miss?
attackcritical-hitdnd-5efighter
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Best Answer
No, for the fighter with Improved Critical a 19 is an auto-hit.
According to a tweet by Crawford a 19 (or 18) for a character with the Improved Critical feature is an automatic hit.
http://www.sageadvice.eu/2015/12/21/are-fighter-champion-improved-critical-hits-like-a-normal-20/