The Shattered Flail is a One-Handed Melee Weapon found in Baldur's Gate 3.
""A bundle of bones and blood - and a soul-piercing demonic presence - is all that remains of the Flind's flail. It would make a decent mace with a particularly nasty bite. "".
Where to Get the Shattered Flail in Baldur's Gate 3
The Shattered Flail can be found in the Risen Road Region. Specifically, it's found as loot from the Flind Gnolls leader.
Shattered Flail Abilities
Concussive Smash - Deal normal weapon damage with the chance to inflice Daze.
Yeenoghu's Gift - Hitting an enemy hears the user for 1d6 HP, but can inflict Mad status if they do not continue hitting an enemy each turn.