Hcor'uk the Colassal's Portable Handheld Weapon of Walloping

Alter: This flail has the two-handed, heavy and reach properties. Attacks made with the flail deal an extra 1d8 bludgeoning damage, or 2d8 if the target is a structure. When you roll a 20 on an attack roll with this weapon against a Huge or smaller creature, the creature must succeed on a DC 16 Strength saving throw or be knocked prone.

The rope and boulder that make this weapon are magically attached and can't be separated. The boulder weighs 200 pounds, but is effortless for you to lift once you attune to the weapon.

Attunement: yes (?)
Rarity: Very Rare
Type: Flail
Cost: 36000gp

Griffons Saddlebag, Vol 1