Improved Critical

From D20advanced

IMPROVED CRITICAL		Combat, Ranked

Your critical threat range with a particular attack (chosen when you acquire this feat) is increased, allowing you to score a critical hit on a roll of 19 or 20. Only a natural 20 is an automatic hit, however, and an attack that misses is not a critical. Each additional rank applies to a different attack or increases your threat range with an existing attack by one more.

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