Adamantite Glaive

A spear is a poke, not a swing. Hold the button and it jabs straight out along one line, hitting everything in that line, and it connects again on the way back. That makes it good against long bodied enemies and anything that funnels toward you down a corridor, and clumsy against fast fliers that circle around behind you.

Reach is the reason to carry it. Standing on a platform and stabbing down into a stream of enemies costs you nothing, and melee speed gear stretches both the range and the rate of attack. If your world rolled the other ore you get the Titanium Trident and give up nothing meaningful.