Just make one up, no rules except that it has to be carried by a person(a person with super strength is acceptable). Just name it and say what it does.
Mine is called Da Narwhaler 9000, it fires baby narwhals at the bad guys. They fly to the bad guy and than skewer as many bad guys as they can before the momma narwhal eats the skewered baddies. And I would be awesome. COWER IN FEAR OF MY MIGHTY Da Narwhaler 9000(you have to use the entire name, it's the law. Call it that or the narwhals eat you, I hope they don't eat me).
Mine is called Da Narwhaler 9000, it fires baby narwhals at the bad guys. They fly to the bad guy and than skewer as many bad guys as they can before the momma narwhal eats the skewered baddies. And I would be awesome. COWER IN FEAR OF MY MIGHTY Da Narwhaler 9000(you have to use the entire name, it's the law. Call it that or the narwhals eat you, I hope they don't eat me).