Hammer Master

Weapons considered Hammers (Light Hammers, War Picks, and Warhammers) you wield Stun appropriate creatures on a critical hit, until the end of your next turn. They also gain the ability to make a knee-breaker attack against a creature of equal size to you; this deals standard weapon damage within the standard weapon reach, the target must make a Constitution saving throw, (DC equals 8 + Str modifier + proficiency bonus) on a failed saving throw the creature becomes slowed due to a broken knee which can be healed with a successful medicine check during a short rest. Light hammers you wield now have an increased standard range out to 30 feet instead of 20 and Warhammers and War Picks you wield gain a throwing range of 20/60.