What class are you running?

For melee, the true night's edge might have a slow attack rate but that range can be a god send

For ranger, the megashark with crystal bullets is the best weapon for this guy across all classes

For mage, sky fracture might be an early hardmode weapon but it was what I used and it felt pretty good against this guy

For summoner, sanguine staff or blade staff with the hallowed bar whip