A large War Hammer with a effigy of a the Holy Fish for the head of it.  Just for when you have to smash the Carp out of something.

1d10 damage 

This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.

PUSH. If you hit a creature with this weapon, you can push the creature up to 10 feet straight away from yourself if it is Large or smaller.

Proficiency with a Heavy Hammer allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, Grants +3 to damage and attack rolls after you attune to this Hammer, Heavy, Versatile