the hammer is OP, its kill range is insane and it seems to show up quite often in the random weapons
I just finished some games where the whole enemy team had found a hammer and a grapple they were running around basically invincible, camping every corner and dropping in from 10 stories above to smash you
Ideas for fixes:
make the hammer slow you down
make its range for a one hit death half the size it is now
classify certain weapons as heavy/one-hitters and have them not appear in your hand but rather on the field or maybe just at a lower rate
give the hammer (and the sword while you are at it) two different kinds of strikes. make it so the only way you can one-hit someone is by charging it, making it more difficult to land. quick hits require two or three strikes for death.