Bloodspite maul

Weapon (maul) Very Rare (12.000 gp)

This blood-stained maul pulses with violent energy, growing more powerful as the wielder’s fury increases. The Bloodspite Maul grants a +2 bonus to attack and damage rolls.

Additionally, if you have the Rage feature, you receive:

Unstoppable Force: Once per rage, the wielder can strike the ground, causing a 2 sqr. (3m) shockwave. All creatures in the area must make a DC 14 Constitution saving throw or be knocked prone, taking 2d6 thunder damage on a failure and half damage on a success. After using this ability, the wielder gains temporary hit points equal to their Barbarian level.