Bundren the Bungler
Weapon (greatclub), uncommon (requires attunement)
This large oaken log has an oafish face carved into it. You gain a +1 bonus to attack and damage rolls made with this magic weapon. Once per turn, you can force a Large or smaller creature hit by this magic weapon to make a DC 13 Strength saving throw or be knocked prone.
Sentience. Bundren the Bungler is a sentient chaotic neutral weapon with an Intelligence of 8, a Wisdom of 10, and a Charisma of 8. It has hearing and darkvision out to a range of 120 feet. The weapon perceives and communicates using its carved face and can speak, read, and understand Common. It has a brutish, fumbling voice.
Personality. Bundren the Bungler is an awakened tree that vexed its creator with its clumsiness to the point that it was chopped down and left for firewood. It will talk incessantly and loudly about all of the follies that have befallen it over its long and storied lifetime.
Curse. You have disadvantage on Dexterity (Stealth) and Dexterity (Acrobatics) checks while attuned to this magical weapon. Additionally, when you roll a 20 to hit with this weapon, the attack always misses.
Errata- Increased DC from 10 to 13 and added "Once per turn"