Storm Maw
This ancient warhammer once resided in Ander Hall and was a prized possession of the the dwarves. Its head is the maw of a vicious looking dragon, teeth barred. This weapon deals thunder damage instead of bludgeoning damage and deals an extra 1d6 thunder damage. If you strike a creature with the hammer it must make a DC 13 Strength saving throw or be knocked back 10 feet.