Improved Critical is a passive feature that increases the wielder's critical hit chance.
Description
The number you need to roll a Critical Hit while attacking is reduced by 1. This effect can stack.
How to learn
Notes
- Having both
The Dead Shot and 
Bloodthirst equipped will stack the effects reducing the threshold by 2.
- The effect will also stack if dual-wield two Bloodthirsts, though you cannot get multiple without third-party tools. Having two Bloodthirsts and The Dead Shot equipped will reduce the threshold by 3.
- The Organ Rearranger passive on the
Knife of the Undermountain King also reduces the critical hit threshold by 1.
- For a full list, see Reducing critical threshold.