MagicasquirrelTMT
Official Terrarian
I'd argue slime staff has some use. You can use it later in the game to farm money with the lucky coin. Granted, it requires you to get 2 extremely rare items, but if you do manage to get them, you get a really good source of money. It is useless in terms of summoner progression (quite a few other summoner weapons are as well tbh), but it has at least some niche use and there are definetly more useless items/weapons.